India is a very large bitumen import market, and it is also the market least likely to accept the grade name written on a standard export offer.
The reason is a change of grading system. India moved from penetration grading to viscosity grading when IS 73 was revised in 2006, and the system was carried into the edition in force today. Every road authority, tender document and refinery data sheet in the country now works in viscosity grades — VG-10, VG-20, VG-30 and VG-40 — under IS 73:2013, Paving Bitumen — Specification, issued by the Bureau of Indian Standards. Quote the edition the tender cites, and take the requirement values from that edition rather than from a remembered table.
That single fact separates India from almost every market around it. Pakistan, Bangladesh, Sri Lanka, Nepal and the Gulf states still specify and buy penetration grades: 60/70, 80/100, 40/50. An offer written in those terms is immediately readable in Karachi, Chattogram or Colombo. Sent to an Indian state Public Works Department or to a contractor working on a national highway package, the same offer is not responsive to the specification, because the number it quotes is not the number the specification controls. If you sell into Bangladesh, Pakistan and Sri Lanka from the same stock, understand that India is the one destination in that group where the certificate itself has to be different, not merely the label on the drum.
The rest of the difference follows from geography and procurement practice rather than from grading. India is a subcontinent with a monsoon that stops bituminous laying across most of the country for roughly four months a year. It has import gateways spread across two coasts, and the road or rail leg from the wrong one can rival the sea leg from the Middle East for cost. And it procures against a stack of documents — the Indian Roads Congress codes and the Ministry of Road Transport and Highways specifications — that sit above the material standard and can tighten it.
India is a very large binder consumer with a very large domestic refining industry behind it, and both facts matter to an exporter. Domestic supply covers the bulk of ordinary demand and moves largely in bulk, by rail and road tanker, from refinery to a contractor's hot-mix plant. An imported cargo is therefore not competing with nothing; it is competing with a mature domestic supply chain that has better inland economics almost everywhere.
What creates the import opportunity is the mismatch between that supply chain and the shape of demand. Indian binder demand is violently seasonal, because the monsoon compresses laying into roughly eight months and the financial year concentrates public works completion into three of them. It is also geographically lumpy: a coastal project close to a port and far from a refinery has a completely different landed-cost arithmetic from an inland project next to one. And a substantial share of Indian work is done by contractors running mobile plants on rural and state packages with no heated tankage at all, for whom packed product is not a second-best option but the only workable one. Those three facts — seasonal peak, coastal geography and packed-product demand — are where an import offer actually lives. An enquiry that does not fit one of them is worth probing before it is priced.
A supplier who thinks of India as one buyer will misread almost every enquiry. The specification that binds a shipment can come from any of the following, and they do not write in the same idiom:
The practical consequence is that there is no single Indian binder clause to quote against, only the clause the specific tender incorporates. Ask for it. A serious Indian buyer will send the extract, and reading it is the fastest way to write an offer that is not set aside.
This page is about the market and the grade: which VG grade, why, for which climate and which traffic, through which gateway, and what the certificate has to prove. The procedural half of an Indian transaction — the classification onto an eight-digit tariff line, the Bill of Entry, the full document set, the certificate-of-analysis format an Indian buyer expects, and the letter-of-credit discrepancies that stop payment — is set out on the companion page, bitumen import to India. The two pages are written to be read together and deliberately do not repeat each other.
It will not give you a duty rate, a price, a named refinery, a terminal relationship, a transit time or a delivery promise. It does not state that any port, berth, terminal, road, railway, inland container depot or corridor is open today, running to a schedule, equipped for this commodity or available for your cargo; geography is described because geography is stable and publicly checkable, while operating status changes and belongs to the freight forwarder who is accountable for it. Road distances are commonly cited approximations given for orientation and nothing more, and no vehicle payloads, vessel capacities, port throughput or draught figures appear anywhere. It states no position on whether bitumen is or is not currently within the scope of any mandatory Indian certification requirement, for the reason set out at length in the conformity section, and it names no currently appointed inspection body. Tariff treatment changes, and the applicable conformity requirement for a specific consignment is a matter for a licensed customs broker on the day, not for a supplier page. Where this page reaches the edge of what can be stated with confidence, it says so rather than filling the gap.
The VG number is not a penetration, not a hardness index and not a quality tier. It is a viscosity, and knowing which viscosity, measured at which temperature, on which material, is most of what a buyer needs.
A viscosity grade is defined by absolute viscosity at 60 °C, expressed in poise and measured by vacuum capillary viscometer to IS 1206 (Part 2), the Indian counterpart of ASTM D2171. Absolute viscosity — also called dynamic viscosity — is the ratio of shear stress to shear rate: a fundamental physical property with a defined unit, not an empirical index. One poise is one dyne-second per square centimetre, and in SI terms 1 poise equals 0.1 pascal-second. So the VG-30 lower limit of 2400 poise is 240 Pa·s, and a European laboratory that reports in pascal-seconds has to be converted before its number can be read against an Indian requirement. That conversion is where a surprising number of arguments start.
The word vacuum in the method name is not decoration. At 60 °C a paving binder is far too stiff to be drawn through a capillary by gravity in any reasonable time, so a partial vacuum is applied to pull it through and the viscosity is computed from the timed flow and the calibration of the tube. A second viscosity, kinematic viscosity at 135 °C in centistokes to IS 1206 (Part 3), the counterpart of ASTM D2170, is controlled alongside it; at that temperature the material flows under gravity alone and no vacuum is needed. Kinematic viscosity is absolute viscosity divided by density, which is why its unit is different: 1 centistokes equals 1 square millimetre per second. The two numbers are not interchangeable and neither is convertible to the other without a density.
The two temperatures are not arbitrary. Sixty degrees Celsius is the conventional reference for the maximum temperature a pavement surface reaches in service across much of India in summer, which is the condition under which rutting occurs. A dark asphalt surface in strong sun runs well above the shaded air temperature, so an air temperature in the low forties produces a pavement temperature far higher, and it is at that temperature that a binder either holds the aggregate skeleton in place under a wheel load or lets it move. One hundred and thirty-five degrees is the conventional reference for mixing and pumping, which is the condition under which the binder has to coat aggregate, move through a plant and be pumped without either dragging or running off the stone.
Penetration grading, by contrast, measures the binder at 25 °C, with a standard needle under a 100 g load for 5 seconds, and reports how far the needle sinks in tenths of a millimetre. Twenty-five degrees is a laboratory convenience, not a service condition; it is a temperature at which an Indian pavement almost never fails. Worse, penetration is an empirical consistency index with no physical unit: it does not measure a property, it measures the outcome of a test. Two binders can be given the same penetration number by that test and behave quite differently at the temperatures that matter. That mismatch — a control at a temperature nothing fails at, using a number that is not a property — is the technical argument that drove the change to viscosity grading.
The number in the grade name is the nominal absolute viscosity in hundreds of poise. VG-10 is nominally 1000 poise, VG-20 is 2000, VG-30 is 3000 and VG-40 is 4000. The accepted band runs twenty percent either side of that nominal figure, which is why the requirement table reads 2400 to 3600 poise for VG-30 and 3200 to 4800 poise for VG-40. Refinery technical data sheets commonly quote the full band, which is the correct thing to quote; the acceptance limits a batch is actually judged against are the ones printed in the edition of the standard the contract cites, so read them from there rather than from a data sheet.
That plus-or-minus-twenty-percent structure is not an Indian invention. It is the band structure of the American viscosity-graded asphalt cement system, in which AC-10, AC-20, AC-30 and AC-40 carry the same nominal values and the same tolerance. The Indian system took the band structure and then wrote its own requirement table around it, and the two are not the same specification — a point developed in the grade equivalence table further down this page.
This is the point most often missed by a supplier reading the table for the first time. Absolute viscosity at 60 °C is a band, not a floor. A batch measuring 3800 poise is out of grade for VG-30 even though it comfortably clears the lower limit of 2400, because it is above the 3600 ceiling.
Two further consequences follow from the twenty percent band structure, and they run in opposite directions, so read the bands against each other and not only on their own. The bands do not tile the scale. Where they fail to meet there is a genuine gap: VG-10 stops at 1200 poise and VG-20 does not begin until 1600, so a batch measuring 1400 poise is out of grade for both and is not a viscosity grade at all. Where they run into one another the problem is the reverse: VG-30 runs up to 3600 and VG-40 begins at 3200, so the two grades overlap between 3200 and 3600 poise. A result inside that window sits in both bands at once and the viscosity figure alone does not settle which grade the batch is; the penetration minimum — 45 dmm for VG-30 against 35 dmm for VG-40 — the softening point minimum of 47 °C against 50 °C, and the kinematic viscosity minimum at 135 °C are what separate them there. The 3800 poise batch above is a case of the same thing seen from the other side: it is not VG-30, but it does fall inside the VG-40 viscosity band, and whether it is actually VG-40 depends on whether the rest of the certificate meets the VG-40 lines too. A single viscosity number is never by itself a grade.
There is engineering behind the upper limit, and it is worth stating because a buyer sometimes assumes stiffer is safer. A binder that is too stiff at service temperature is harder to mix and harder to compact, which means the mat is more likely to be laid short of its target density; a mix compacted short of density is permeable, and a permeable mix in an Indian monsoon is a moisture-damage problem regardless of how rut-resistant the binder is. A too-stiff binder is also more brittle at the cold end, which matters in the northern plains and in the hills. The band is not a manufacturing tolerance. It is a statement that the engineer wants a binder in a defined consistency window, and both edges of the window are there for a reason.
The kinematic viscosity minimum — 250 cSt for VG-10 rising to 400 cSt for VG-40 — is controlled as a minimum only, and the reason is instructive. At mixing temperature the risk the standard is guarding against is a binder that is too thin: one that drains off the aggregate in the mixer or in the haul truck, leaving a fat bottom and a lean surface in the load. A minimum kinematic viscosity is a floor under that behaviour. It is also the number a plant operator ultimately uses, because mixing and compaction temperatures for a binder are derived from its viscosity-temperature relationship rather than from a rule of thumb. This is the line most often absent from a Middle East export certificate, and if a project engineer is doing his job he will ask for it. See the bitumen heating temperature guide for what happens when it is guessed at instead.
IS 73:2013 retains penetration at 25 °C as a minimum requirement within each grade — 80 dmm for VG-10, 60 for VG-20, 45 for VG-30 and 35 for VG-40. It functions as a secondary control that stops a binder reaching its viscosity for the wrong reason. A binder can be made stiff at 60 °C by being a genuinely heavy straight-run residue, or it can be made stiff by air-blowing, which raises softening point and viscosity while driving penetration down disproportionately. The penetration minimum, read alongside the softening point minimum, is what catches the second case. It does not classify the grade, and a cargo can satisfy the penetration minimum comfortably while failing the viscosity requirement outright, but it is not a spare line and it should not be treated as one.
Softening point by the ring and ball method, to IS 1205 and its counterpart ASTM D36, rises across the grades: 40 °C for VG-10, 45 for VG-20, 47 for VG-30 and 50 for VG-40. It is an equiviscous temperature rather than a phase change — bitumen has no melting point — and it is the single most useful cross-check on a certificate, because it is cheap, it is reported almost everywhere, and it moves in a predictable relationship with penetration for a given production route. When penetration and softening point stop being consistent with one another, the material has usually been processed rather than merely refined, and that is worth knowing before a cargo is fixed. It is also the number to think with when planning storage in an Indian summer, which is why it reappears in the packing table on this page.
Flash point by Cleveland open cup, to IS 1448 (P:69) and ASTM D92, is set at a minimum of 220 °C for every VG grade. It is a safety line rather than a performance line, and it does two jobs. It sets an outer bound on how hot the material may be handled, which matters in a country where drummed product is routinely decanted into a site melter. And it is a contamination detector: a paving binder cut with a lighter petroleum stream will flash low, and a flash point materially below the specification is a finding to act on rather than a number to average away.
Solubility in trichloroethylene, to IS 1216 and ASTM D2042, is set at 99.0 percent minimum. It is the line that establishes that the material is bitumen rather than bitumen extended with mineral matter, and on any market where adulteration is a live risk it is the most valuable single line on the certificate. If a certificate omits solubility, treat that as a finding rather than an oversight. There is more on this in the notes on bitumen fraud prevention.
The last block of the requirement table is not measured on the binder as delivered. It is measured on the residue left after the binder has been artificially aged, because what a pavement actually contains is not the binder that left the refinery but the binder that survived being heated to mixing temperature, coated onto hot aggregate, hauled, laid and rolled. IS 73:2013 does that ageing with the rolling thin-film oven test, to IS 9382 and its counterpart ASTM D2872, and controls two things on the residue: the viscosity ratio at 60 °C, capped at 4.0 for every grade, and ductility at 25 °C, with a minimum that tightens from 75 cm for VG-10 to 25 cm for VG-40.
The viscosity ratio is the elegant part of the specification and the part most often misread. It is not an absolute limit on the aged viscosity; it is the aged viscosity divided by the original viscosity. A cap of 4.0 says that the binder may not stiffen by more than a factor of four during short-term ageing, whatever it started at. That makes it a measure of durability rather than of consistency, and it is the requirement a heavily processed or heavily cracked-stock material is most likely to fail while passing every other line in the table. A supplier who can produce a viscosity ratio figure on the batch is telling an Indian engineer something that no penetration certificate can tell him.
One requirement in IS 73 is not a number at all. Ahead of the numerical table the standard carries a general condition on the material itself: that it be homogeneous, free from water, and that it not foam when heated to the temperature the clause names. That is not a formality on a drummed import. Water in a drum — from condensation in a humid coastal yard, or from monsoon rain standing in the depression that forms on the top head as the block cools and shrinks — flashes to steam when the drum is charged into a hot melter, under a layer of bitumen, and the result is violent foaming and boil-over. The clause is a specification requirement; keeping the drums dry is how a buyer actually complies with it.
The properties below are the ones an Indian engineer checks on a batch Certificate of Analysis, with the Indian test method and its international counterpart. Absolute viscosity at 60 °C is the line that decides the grade; everything else is a control around it. The first row is not a requirement — it is the nominal value the grade name encodes, shown so the twenty percent band structure below it can be read at a glance.
| Property | Test method | VG-10 | VG-20 | VG-30 | VG-40 |
|---|---|---|---|---|---|
| Nominal viscosity the grade name encodes, poise | Designation basis, not a test | 1000 | 2000 | 3000 | 4000 |
| Absolute viscosity at 60 °C, poise | IS 1206 (Part 2) / ASTM D2171 | 800–1200 | 1600–2400 | 2400–3600 | 3200–4800 |
| Kinematic viscosity at 135 °C, cSt, min | IS 1206 (Part 3) / ASTM D2170 | 250 | 300 | 350 | 400 |
| Penetration at 25 °C, 100 g, 5 s, dmm, min | IS 1203 / ASTM D5 | 80 | 60 | 45 | 35 |
| Softening point, ring and ball, °C, min | IS 1205 / ASTM D36 | 40 | 45 | 47 | 50 |
| Flash point, Cleveland open cup, °C, min | IS 1448 (P:69) / ASTM D92 | 220 | 220 | 220 | 220 |
| Solubility in trichloroethylene, wt %, min | IS 1216 / ASTM D2042 | 99.0 | 99.0 | 99.0 | 99.0 |
| Viscosity ratio at 60 °C after ageing, max | RTFOT residue — IS 9382 / ASTM D2872 | 4.0 | 4.0 | 4.0 | 4.0 |
| Ductility at 25 °C on aged residue, cm, min | RTFOT residue — IS 1208 / ASTM D113 | 75 | 50 | 40 | 25 |
This is the single most expensive misunderstanding in bitumen supply to India, and it is not a paperwork problem. A buyer holding a penetration-grade certificate and an Indian tender naming a VG grade is holding two documents that describe different properties, measured at different temperatures, on differently aged material. No table converts one into the other.
ASTM D946, the reference behind most Middle East export documentation, classifies by penetration at 25 °C: a needle test, on unaged binder, reporting an empirical index with no physical unit. IS 73:2013 classifies by absolute viscosity at 60 °C: a capillary flow measurement, under vacuum, reporting a fundamental property in poise. Those are not two ways of expressing the same quantity. They are two different quantities, taken 35 degrees apart, and the relationship between them depends on a third variable the penetration test says nothing about.
That third variable is temperature susceptibility — how fast a particular binder changes consistency as temperature changes. Two binders can be given an identical penetration of 65 dmm at 25 °C and then diverge substantially by the time both are heated to 60 °C, because one has a flatter viscosity-temperature curve than the other. Susceptibility is set by the crude source and by the processing route: a straight-run residue from one crude, a vacuum residue from another, a semi-blown product, and a blend of two streams can all be brought to the same penetration and will not share the same viscosity at 60 °C. That is precisely the pair of binders that behave differently in an Indian summer, and it is precisely the difference the Indian standard was rewritten to control.
There is a second gap, and it is less obvious. Both standards test the binder as supplied, but they age it differently before testing the aged properties. ASTM D946 controls ageing on the residue from the thin-film oven test, ASTM D1754, which holds a static 3.2 mm film in a shallow pan in a ventilated oven at 163 °C for five hours, and expresses the requirement as a minimum retained penetration. IS 73:2013 controls ageing on the residue from the rolling thin-film oven test, ASTM D2872 and its Indian counterpart IS 9382, which rolls a moving film around the inside of a rotating glass bottle at 163 °C for 85 minutes with an air jet directed into the bottle, exposing fresh surface continuously, and expresses the requirement as a maximum viscosity ratio and a minimum ductility.
Those are different exposures producing different degrees of ageing, and the properties reported afterwards are different properties measured on different residues. Retained penetration after TFOT and viscosity ratio after RTFOT are not two names for one result. There is no factor that converts between them. A certificate carrying one has simply not evidenced the other.
Run a typical Middle East export certificate for Bitumen 60/70 line by line against the IS 73:2013 requirement for VG-30 and the picture becomes concrete. Three lines are satisfied, one is usually satisfied, and four are simply missing.
So the honest summary is this: a 60/70 certificate satisfies the two secondary controls of VG-30 and is silent on all four of the properties that define it. An engineer who rejects it is not being obstructive. He is observing that the document does not address his specification.
The gap is closable, and closing it is cheap relative to a rejected cargo. Write these into the contract as a test schedule, run on the batch that will actually load, not on a typical-values sheet:
Two procedural points travel with that list. First, the sample has to be drawn properly: sampling to IS 1201 or ASTM D140, across the consignment rather than from one convenient drum, with retained samples sealed and held by both parties. A viscosity figure from an unrepresentative sample is worse than no figure, because it looks like evidence. Second, Indian buyers increasingly ask that the testing laboratory be accredited, and a report from a laboratory holding recognised accreditation carries further in an acceptance argument than one that does not. Ask which laboratory before you ask for the price of the test.
A measured viscosity is a fact about one batch, not a property of a grade. If a 60/70 batch measures 2600 poise it sits inside the VG-30 band and the buyer has an evidenced case to put to the engineer; if it measures 2100 poise it does not, and no amount of correspondence changes that. If it measures 3700 poise it is above the VG-30 ceiling of 3600 and cannot be VG-30, although it does sit inside the VG-40 viscosity band of 3200 to 4800 — whether it is VG-40 then turns on the penetration, softening point, kinematic viscosity and RTFOT residue lines, and a 60/70 batch at the soft end of its own band will normally fail the VG-40 softening point minimum of 50 °C. And if it measures anywhere between 3200 and 3600 poise the figure is inside the VG-30 and VG-40 bands simultaneously and settles nothing on its own. Do not average results across batches, do not present a previous batch's figure for a current cargo, and do not treat a favourable result as a general property of the product going forward. Production varies within a grade band, which is exactly why the Indian standard controls the property directly instead of inferring it.
Where an Indian project specification names a VG grade, supply that grade, and have any cross-reference approved by the engineer in writing before shipment. A conversion table is a starting point for a conversation, never a defence at the discharge port, and an argument that begins after a cargo has been discharged in India and hauled several hundred kilometres inland has no realistic reverse gear. The bitumen grade equivalence page sets out the cross-system comparisons in full, and the viscosity grade bitumen page carries the grade-by-grade requirement detail.
Indian project documents have a long life, and a tender drafted from an older template will still occasionally name a designation from IS 73:1992. Those designations were penetration grades, and the letter in front of the number encoded the crude source: A denoted bitumen produced from Assam petroleum and S denoted bitumen from sources other than Assam. The number was the nominal penetration. Viscosity grading replaced that system when IS 73 was revised in 2006 and is carried into IS 73:2013, so none of these designations survives in the current standard and none of them maps onto imported cargo. The lower half of the table covers the foreign designations an exporter is most likely to be holding instead.
| Designation | Where it comes from | Status | What to do when a document names it |
|---|---|---|---|
| S-65 | IS 73:1992 penetration grading. S denoted bitumen from sources other than Assam; 65 was the nominal penetration, giving a 60–70 dmm band. | Superseded by viscosity grading | Read it as a penetration 60–70 requirement, then ask the engineer to restate the requirement as a VG grade — normally VG-30 — in writing before the contract is signed. |
| A-65 | IS 73:1992. A denoted bitumen produced from Assam petroleum, at the same nominal penetration of 65. | Superseded by viscosity grading | The letter encoded a crude source inside India, not a quality tier and not a performance requirement. It has no meaning at all for imported cargo. Ask for the VG grade. |
| S-90 / A-90 | IS 73:1992, nominal penetration 90. | Superseded by viscosity grading | The nearest current grade is VG-10. Confirm acceptance against the viscosity requirement, not against the penetration band. |
| S-35 / A-35 | IS 73:1992, nominal penetration 35. | Superseded by viscosity grading | The nearest current grade is VG-40. Again, absolute viscosity at 60 °C is the controlling line. |
| VG-10, VG-20, VG-30, VG-40 | IS 73:2013, viscosity grading by absolute viscosity at 60 °C. | Current | This is what the contract, the letter of credit and the Certificate of Analysis should all name, in identical wording. |
| ASTM 60/70 | ASTM D946 penetration grading, the common Middle East export designation. | Not an Indian grade | It clears the VG-30 penetration minimum of 45 dmm with room to spare, but penetration does not classify the grade. Some 60/70 production reaches 2400 poise and some does not, and the penetration certificate cannot tell you which. Obtain a measured absolute viscosity figure, plus the kinematic viscosity and the two RTFOT residue results. |
| ASTM 40/50 | ASTM D946, the harder Middle East export grade. | Not an Indian grade | The grade most often floated against a VG-40 clause. It clears the VG-40 penetration minimum of 35 dmm and will usually clear the 50 °C softening point minimum, but VG-40 requires 3200 to 4800 poise and that has to be measured. A 40/50 batch can also overshoot the VG-40 upper limit, which is a failure in the other direction and is the one nobody tests for. |
| EN 12591 50/70 | European penetration grading. | Not an Indian grade | Same caution, with an added practical problem: a European mill certificate will usually not report absolute viscosity at 60 °C in poise at all, and may report viscosity in pascal-seconds if it reports it. Commission the test specifically, and convert the units before comparing. |
| AC-30 | The American viscosity-graded asphalt cement system — AASHTO M226 and its ASTM counterpart D3381 — from which the Indian VG band structure descends. | Not an Indian grade, but the closest relative | The nominal-value-plus-or-minus-twenty-percent band is the same idea and the 60 °C viscosity is the same measurement, which makes this the most seductive substitution on the list. It is still not VG-30: the American system controls ageing on the thin-film oven residue rather than the rolling thin-film oven residue, and its penetration and kinematic viscosity minima are not written to the same numbers as IS 73:2013. Take the requirement table from the edition and the table the document in front of you actually cites, rather than from a remembered one, and read it against IS 73:2013 line by line before offering one against the other. |
| PG 64-10, PG 70-10 and similar | AASHTO M320 performance grading. | Not an Indian grade | A different measuring system entirely, built on dynamic shear rheometry and bending beam rheometry rather than on viscosity or penetration. A PG designation cannot be converted into a VG grade in either direction. Where a project genuinely wants performance grading it will say so and will cite the tests; see the performance grading guide. |
| Oxidized grades such as 85/25 or 90/15 | Industrial blown bitumen, a different product family with its own standards. | Not paving bitumen at all | These appear in Indian enquiries because the numbers look like a grade pair. They are a softening point and a penetration for an industrial product used in roofing, waterproofing and pipe coating, and they answer no part of a VG clause. See oxidized bitumen if that is genuinely what the enquiry wants. |
| Modified binder designations | A separate Indian product standard for polymer and rubber modified bitumen, specified through the IRC guidance on modified binders. | Current, but a different standard | Modified grade names do not sit on the VG scale and are not a step above VG-40. Where a tender calls for a modified binder, the acceptance table is the modified-binder standard, not IS 73:2013, and the additional lines — elastic recovery, separation on storage, the modification type — have to be on the certificate. See polymer modified bitumen and crumb rubber modified bitumen. |
Grade choice in India is driven by pavement temperature and by traffic loading, not by preference. IS 73:2013 carries selection guidance keyed to the highest and lowest daily mean air temperature at the site, and the IRC design codes then decide how heavily the binder will be worked. Take the guidance matrix itself from the published standard the tender cites; what follows is the direction of travel and the reasoning behind it.
Band 800 to 1200 poise, penetration minimum 80 dmm, softening point minimum 40 °C. The softest of the four. Associated with spray applications — surface dressing and penetration macadam — and with paving in the coldest parts of the country, which in India means the Himalayan states rather than anywhere in the plains. It is also the usual base binder for bitumen emulsion and for cutback grades, and that is where much of its volume actually goes. See VG-10 bitumen.
Band 1600 to 2400 poise, penetration minimum 60 dmm, softening point minimum 45 °C. The cold-climate and high-altitude paving grade. In practice it is the least traded of the four, because many Indian projects step straight from VG-10 to VG-30 and the intermediate case is comparatively rare. Confirm the tender genuinely calls for it before sourcing it, and confirm again that the buyer is not using the name loosely for a softer VG-30. See VG-20 bitumen.
Band 2400 to 3600 poise, penetration minimum 45 dmm, softening point minimum 47 °C. The mainstream paving grade for most of India: dense bituminous macadam and bituminous concrete across the plains and the peninsula, where summer pavement temperatures are high and the failure being designed against is rutting rather than low-temperature cracking. If an Indian enquiry names no grade, this is the one it probably means, but ask rather than assume. See VG-30 bitumen.
Band 3200 to 4800 poise, penetration minimum 35 dmm, softening point minimum 50 °C. Specified for highly stressed locations — intersections, toll plazas, bus bays, truck lay-bys, container terminal and port pavements, weighbridge approaches and steep grades — where traffic stands still, brakes or turns and the binder carries sustained shear at high temperature. This is a loading decision, not a climate decision, and it usually applies to defined sections of a contract rather than to the whole of it. See VG-40 bitumen.
The standard's selection guidance works on two air-temperature axes: the highest daily mean at the site, which pushes the choice toward the harder grades, and the lowest daily mean, which pushes it back toward the softer ones. India is unusual in that both axes bite in the same place. The northern plains have among the highest summer maxima in the country and a genuine winter underneath them, so the site with the strongest argument for VG-40 in June has the strongest argument against it in January. Read the matrix from the published standard for the site's actual recorded temperatures, not from a national habit.
Indian flexible pavement design is done in million standard axles, and the design criteria are rutting in the subgrade and fatigue cracking in the bituminous layer. Traffic enters the binder decision twice: through the total design traffic, which drives layer thickness and therefore how hard the binder works, and through the character of the traffic at a specific location. A high-volume free-flowing carriageway and a toll plaza approach carrying the same daily traffic are different binder problems, because at the plaza the load dwells. That is the whole reason VG-40 exists as a separate grade rather than as a general upgrade.
This is the card that matters most. India spans the Himalaya and the Deccan, a northern plain with cold-wave winters and a southern peninsula that has no winter at all, the wettest places on earth in the northeast and a true desert in the northwest. A supplier who answers the question what grade does India use with a single grade name has not asked where the site is. The honest answer is that VG-30 covers the largest share of the plains and the peninsula, VG-40 covers loaded locations anywhere, and VG-10 and VG-20 cover the hills and the spray work — and that the site's town and altitude have to be established before any of that is applied.
Polymer modified and crumb rubber modified bitumen are covered by a separate Indian product standard and are specified through the IRC guidance on the use of modified bitumen in road construction. High-traffic corridors, heavy-duty layers, junctions and long grades frequently call for them, and in Indian practice a modified binder is often what is actually being asked for when a clause reaches past VG-40. Confirm whether the tender wants a modified binder before quoting an unmodified VG grade against it, and note that a modified product carries certificate lines — elastic recovery, separation on storage, the modifier type — that a VG certificate does not.
Bitumen emulsion for tack coats, prime coats and cold works, and cutback grades for priming, are separate Indian product standards with their own acceptance tables, and they carry real volume in India because of the scale of rural and low-volume sealed road work. VG-10 is the usual base binder. A VG certificate does not evidence conformity for either of them. Two practical cautions: an emulsion has a finite storage life and dislikes heat and agitation, which sits badly with a long inland leg in an Indian summer, and a cutback carries solvent with a completely different flash point and handling regime. See prime coat versus tack coat.
Indian geography conventionally divides the country into four broad climate groups: tropical wet, tropical dry, subtropical humid and montane. Those four are the right frame for a binder decision, but two of them have to be split before they are useful, because the binder consequence differs inside them. The rows below are ordered from the wettest to the coldest. The single most important line in the table is the contrast between the fifth row and everything above it: the northern plains have a genuine winter, and the peninsula does not. That is why a grade chosen for Chennai is not automatically right for Ludhiana, and why the northern plains are the hardest part of India to write one specification for.
| Zone | Where it is | Temperature and rainfall character | What it does to the binder and which way it pushes the grade |
|---|---|---|---|
| Tropical wet — the south-west coast and the Western Ghats | Kerala, coastal Karnataka, the Konkan coast of Maharashtra and Goa, and the windward slopes of the Western Ghats | Hot and very humid with a small annual temperature range and no cool season. Rainfall is among the heaviest in the country and arrives with the onset of the southwest monsoon, which makes landfall on this coast first, around the start of June | Two problems, and only one of them is the binder grade. The first is rutting: sustained high pavement temperature with humid nights that give the pavement little relief points toward the harder end of the range for loaded pavement. The second, and the larger one here, is moisture damage — water working into the mix, breaking the bond between binder and stone and stripping the film off the aggregate. That is answered in the mix design and in the aggregate, not in the VG number, and where the aggregate has poor affinity it is answered with an anti-stripping additive. For packed cargo this is also the most aggressive storage environment in India: heat, salt air and rain together. |
| Tropical wet — the northeast | Assam, Meghalaya, Arunachal Pradesh, Tripura, Mizoram, Nagaland and Manipur, plus north Bengal | Warm and extremely wet, with the highest rainfall totals recorded anywhere on earth on the Meghalaya slopes, and a monsoon that runs long — roughly May to October. Winters are mild in the valleys and cold in the hills | The laying window, not the grade, is the governing constraint. Bituminous mixes cannot be laid on a wet surface at all, so the working season is short and is defined by rain rather than by temperature. The binder consequence is indirect but expensive: material has to be pre-positioned inland before the rains rather than called off against a schedule, and the inland leg through the Siliguri corridor is itself rain-sensitive. Moisture damage in service is the dominant durability risk. |
| Tropical dry — the Deccan and the peninsular interior | Interior Maharashtra, Telangana, interior Karnataka, interior Andhra Pradesh, interior Tamil Nadu and much of Madhya Pradesh | Hot, semi-arid, with a pronounced dry season, a wide day-to-night temperature swing and a summer that runs hard from March to June before the monsoon breaks. No winter in any engineering sense — nights are cool, not cold | The classic VG-30 case, and the case the Indian grading system was really written for. High pavement temperature, no low-temperature constraint worth writing a clause about, and rutting as the unambiguous governing failure mode. The wide diurnal swing means the binder cycles further each day than the daytime maximum alone suggests, which is a fatigue consideration on thin pavements but does not reach the point of a low-temperature requirement. Loaded locations here take VG-40 or a modified binder. |
| Tropical dry — the arid north-west | Western Rajasthan and the Thar, Kachchh in Gujarat and the drier parts of southern Haryana | The hottest conditions in India, with summer maxima commonly reported approaching or reaching the high forties Celsius, very low humidity, intense solar radiation, sparse and erratic rainfall, and a very large day-to-night swing. Winter nights are genuinely cold | The severe end of the Indian pavement temperature case, and the strongest climate argument in the country for the harder grades and for modification on loaded sections. But note the second half of the description: this is also a zone with cold winter nights, so the binder is being cycled through a very wide annual range as well as a wide daily one. Sand and dust are a plant and mix-quality problem here, and construction water is scarce enough to constrain compaction. Drums stored uncovered deteriorate faster than a buyer expects. |
| Subtropical humid — the Indo-Gangetic plain | Punjab, Haryana, Delhi and the National Capital Region, Uttar Pradesh, Bihar and the Bengal plain | The zone with the widest annual span in populated India. Summer maxima in May and June are among the highest in the country; January mean daily minima in Delhi are commonly cited around 7 °C, with cold waves, ground frost in parts of Punjab and Haryana, and dense winter fog. The monsoon runs roughly late June to September | The northern plains have a real winter and the peninsula does not, and this is the row that proves it. A binder here has to survive a summer as hot as the Deccan's and then a winter the Deccan never sees, which is a wider annual thermal cycle than any other populated part of India imposes. The consequence is that the case for reaching straight for the hardest available grade is weaker here than the summer alone suggests, because thermal cracking at the cold end is a live risk and not a formality. It is also the most populous belt in the country, which is the reason a great deal of the market's VG-30 volume lands here. Winter fog is a separate, practical problem: it disrupts night paving and slows road haulage in late December and January. |
| The eastern coastal belt | The coastal strip of Tamil Nadu, Andhra Pradesh, Odisha and southern West Bengal | Hot and humid with a small annual range and no winter. Tamil Nadu and the southern Andhra coast take their main rain from the northeast monsoon, October to December, which inverts the national calendar. The Odisha and northern Andhra coast takes the southwest monsoon as well. Cyclone exposure is real on this coast, in the pre-monsoon and again in the post-monsoon period | Rutting-dominated, like the peninsula behind it, with the same moisture-damage overlay as the west coast. The distinctive consequence here is not the grade but the calendar: a cargo timed for an October start on the assumption that the monsoon has finished has been timed into the local rainy season. Cyclone risk clusters berth and haulage delays around events rather than spreading them evenly, so float in the discharge window is worth more here than an optimistic schedule. |
| Montane — the Himalaya and the high north | Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, the higher districts of Arunachal Pradesh and the hill districts of the northeast | Cold, with a paving season that runs roughly May to October and a winter that closes high-altitude work entirely. Winter minima at high altitude fall well below freezing — commonly far below it in Ladakh — and freeze-thaw cycling is a real pavement process rather than a theoretical one | The one part of India where the low-temperature end of the specification is the governing engineering question rather than a formality. This is where the softer grades belong, and where a binder chosen for a Rajasthan summer is exactly the wrong material. Two practical points travel with it. The season is the inverse of the plains, so cargo has to be inland and stockpiled before the passes close and the binding constraint is the mountain road rather than the port. And a standard export certificate carries no low-temperature line at all, so if the project wants one it has to be agreed in writing and commissioned deliberately. |
IS 73:2013 defines the material. It is not, on its own, the document a contractor is working to. Indian road procurement layers two further families of specification on top of it, and either can tighten what the material standard allows.
Four documents stand between a refinery and an Indian pavement, and they bind in this order. The material standard, IS 73:2013, says what paving bitumen is. The construction specification, published by the Ministry of Road Transport and Highways, says how it is mixed, laid and compacted and which grade goes in which layer. The design and practice codes of the Indian Roads Congress say how the pavement was designed and what it is expected to carry. And the project specification and special conditions of contract sit above all three and can tighten any of them. When those four disagree, the contract governs, and a supplier who has read only the first of them has read the least binding one.
The Specifications for Road and Bridge Works, published by the Ministry of Road Transport and Highways and known in the trade as the orange book, is the master construction specification for national highway work and is adopted widely by state authorities and by highway concessionaires. Its bituminous works section — Section 500, Bases and Surfacings (Flexible) — governs mix types, binder content, laying and compaction, and names the binder grades acceptable for each layer. The mix types a supplier meets in Indian enquiries all live there: bituminous macadam, dense bituminous macadam, bituminous concrete, semi-dense bituminous concrete, open-graded premix surfacing, surface dressing and seal coats, together with prime coat and tack coat. Indian bituminous mix design in that section is Marshall-based rather than volumetric in the Superpave sense, which is worth knowing when a buyer asks for data an export certificate has never carried.
The orange book is periodically revised, so the operative question in any tender is which revision that tender incorporates. Confirm it from the tender document itself rather than assuming the newest edition applies. A state package assembled from a departmental template can be working to a revision several years behind the national one, and the binder clause is one of the places where the revisions differ.
The Indian Roads Congress is the body that publishes the design and practice codes sitting alongside the MoRTH specifications, and its numbering is what an Indian engineer will quote at you. Two of its documents come up often enough to be named. IRC:37, the guidelines for the design of flexible pavements, is where the pavement's design traffic in million standard axles and its layer thicknesses come from, and therefore where the question of how hard the binder is being worked is actually settled; its two design criteria are rutting and fatigue cracking, which is why Indian binder conversation returns to those two failure modes rather than to any others. IRC:SP:53, the guidelines on the use of modified bitumen in road construction, is the document that decides when an unmodified VG grade stops being acceptable.
Beyond those two, the codes a binder supplier meets are best identified by function rather than by number, because template drafting and periodic revision make a remembered number a liability: there is a specification for dense graded bituminous mixes, a code of practice for prime and tack coats, a code for surface dressing, and a code of practice for the maintenance of bituminous surfaces. Take the number from the tender. Quoting a code number back at an Indian engineer and getting it wrong costs more credibility than not quoting one at all.
For a supplier the point is procedural rather than technical. When an Indian buyer sends a specification extract, it will normally be an IRC or MoRTH clause rather than a page of IS 73. Read the clause, identify the binder grade it names, and quote against that grade explicitly. Quoting a generic export specification into an IRC clause is how offers get set aside without a reply.
IS 73:2013 assesses short-term ageing on the residue from the rolling thin-film oven test (RTFOT), to IS 9382, the Indian counterpart of ASTM D2872. Two properties are controlled on that residue: the viscosity ratio at 60 °C, capped at 4.0 for every grade, and ductility at 25 °C, with a minimum that tightens as the grade hardens. How that test differs mechanically from the thin-film oven test, and why no correlation factor closes the gap between the two, is set out in full in the conversion-trap section above; what belongs here is the commercial consequence.
This matters commercially because the standard Middle East penetration-grade export specification controls ageing by TFOT — loss on heating and retained penetration — and that is what a refinery Certificate of Analysis will often carry by default. Presented against a VG specification, such a certificate has performed the wrong ageing procedure, and the viscosity ratio the Indian standard actually requires is simply absent. Raise this at the enquiry stage. Asking a supplier to add RTFOT to the test schedule before a batch is certified costs very little; discovering the omission when a consignment is presented for acceptance costs a great deal more.
The certificate of analysis guide sets out the document itself in detail, and the bitumen test methods page covers what each test actually does.
India has two coasts and no single natural gateway. Which port a cargo should discharge at is decided by where the project sits, not by ocean freight alone, because the inland leg from the wrong port can add over a thousand kilometres of road haulage and days of schedule to a drummed consignment. The broad split runs like this: the Gujarat and Maharashtra ports serve the west, the north and the landlocked centre; the Karnataka, Kerala and Tamil Nadu ports serve the south; and the Bay of Bengal ports serve the east and, through the Siliguri corridor, the northeast. Road distances below are commonly cited approximations given for orientation only; an actual routing, and whether any facility is available for this commodity on your date, is a question for a freight forwarder in writing.
| Port | Coast and state | Hinterland it realistically serves | What it means for a bitumen cargo |
|---|---|---|---|
| Mundra | West coast, Gujarat, on the Gulf of Kachchh | Gujarat, Rajasthan, Delhi and the National Capital Region, Haryana, Punjab and western Uttar Pradesh. Commonly cited road distance to Delhi is of the order of 1,100 km | A large privately developed port operating under the state maritime board rather than as a Union-administered major port, with rail connectivity into the northern hinterland. Usually the sensible choice when the project is in landlocked north India, because a rail leg replaces a very long road haul. The commercial arrangements at a non-major port differ from those at a major port and are worth understanding before the gateway is fixed. |
| Deendayal (Kandla) | West coast, Gujarat, on the Gulf of Kachchh | Gujarat, Rajasthan and north-west India. Commonly cited road distance to Jaipur is of the order of 900 km | A long-established Union-administered major port, renamed from Kandla and now constituted as a port authority. Liquid cargo handling infrastructure exists in the region, but access to heated tankage for bitumen is a contracted commercial arrangement with a terminal operator and must never be assumed from the port name alone. Nothing on this page states that any Indian facility handles bitumen in bulk. |
| Jawaharlal Nehru Port (Nhava Sheva) | West coast, Maharashtra | Mumbai, Pune, wider Maharashtra and, by road and rail, Madhya Pradesh and Vidarbha. Commonly cited road distances put Pune at around 150 km, Indore at around 600 km, Nagpur at around 850 km and Delhi at around 1,400 km | A major container gateway and, for many buyers, the default entry point for packed and containerised cargo on the west coast. The road leg to Pune is short; into central India it runs into the high hundreds of kilometres, and to Delhi it is longer than the haul from Mundra. It is also the coastal end of the western dedicated freight corridor toward the Delhi region, which is why a north Indian buyer should ask about rail before assuming road. |
| Mumbai Port | West coast, Maharashtra | Mumbai city and its immediate industrial hinterland | The older port immediately north of Nhava Sheva, handling a different mix of cargo. For a packed bitumen consignment the container services and the inland connections at Nhava Sheva are usually the reason a cargo goes there instead, but Mumbai Port remains a gateway a buyer will see quoted and it is worth knowing they are separate ports with separate procedures. |
| New Mangalore | West coast, Karnataka | Coastal Karnataka and, over the Ghats, the Bengaluru and interior Karnataka corridor. Commonly cited road distance to Bengaluru is of the order of 350 km | A Union-administered major port on the Karnataka coast. Its usefulness for a bitumen buyer is that it offers a west-coast entry to the southern interior without the run down from Mumbai or up from Kerala, but the road leg climbs the Western Ghats, which is a gradient and monsoon-reliability question rather than a distance one. |
| Cochin (Kochi) | West coast, Kerala | Kerala and the far south-west, with reach into western Tamil Nadu. Commonly cited road distance to Coimbatore is of the order of 190 km | Serves the region the monsoon reaches first. The laying window here closes earlier than anywhere else in the country, which compresses the useful discharge period rather than the sailing schedule. A container gateway with transhipment services, which matters for a buyer whose parcel is too small to justify a direct call. |
| V.O. Chidambaranar (Tuticorin) | South-east coast, Tamil Nadu | Southern Tamil Nadu. Commonly cited road distance to Madurai is of the order of 140 km | The southernmost mainland gateway. Useful when a project sits below the Chennai catchment, because it avoids an unnecessary north-to-south haul down the peninsula. Sits squarely in the northeast monsoon belt, so its discharge calendar is the inverse of the national one. |
| Chennai | East coast, Tamil Nadu | Northern Tamil Nadu, southern Andhra Pradesh and the Bengaluru corridor. Commonly cited road distances put Bengaluru at around 350 km and Hyderabad at around 630 km | The main south-eastern gateway with dense container services. The road leg to Bengaluru is roughly a day's haul, which makes it the practical port for a large part of the southern interior. Cyclone exposure in the post-monsoon period is a schedule risk to build float against rather than a reason to avoid the port. |
| Kamarajar (Ennore) | East coast, Tamil Nadu, immediately north of Chennai | The same hinterland as Chennai | A separate major port a short distance up the coast from Chennai, developed to take bulk and industrial cargo off the city port. It is named here because a buyer will see it quoted as an alternative to Chennai and should not assume the two are interchangeable in procedure or in what any given terminal will handle. Which of the two suits a specific consignment is a forwarder question. |
| Visakhapatnam | East coast, Andhra Pradesh | Andhra Pradesh, Telangana, southern Odisha and Chhattisgarh. Commonly cited road distances put Hyderabad at around 620 km and Raipur at around 530 km | A deep natural harbour on the eastern seaboard with substantial bulk and liquid cargo activity, and an adjacent separately developed port. The inland legs to Hyderabad and into Chhattisgarh are long but run on good highway, which makes this the natural gateway for the eastern interior rather than for the coast alone. |
| Paradip | East coast, Odisha | Odisha, eastern Chhattisgarh and the Jharkhand mineral belt. Commonly cited road distances put Bhubaneswar at around 110 km and Raipur at around 650 km | A major bulk-handling port serving an industrial and mineral hinterland. For a bitumen buyer it is the sensible eastern gateway for an Odisha or eastern Chhattisgarh project, and it avoids the Hooghly entirely, which is its practical advantage over the Kolkata system. |
| Haldia | East coast, West Bengal, on the Hooghly | West Bengal, Bihar, Jharkhand and, through the Siliguri corridor, the northeastern states. Commonly cited road distances put Patna at around 700 km, Siliguri at around 600 km from Kolkata and Guwahati at around 1,000 km from Kolkata | The seaward dock system of the Kolkata port complex, on a river approach where conditions and continuous dredging constrain vessel size, so parcel size is a question to settle with the carrier early. Cargo destined for the northeast faces one of the longest inland legs in the country, through a narrow corridor, and that leg must be planned around the rains rather than after them. |
| Kolkata (Syama Prasad Mookerjee Port) | East coast, West Bengal, upriver on the Hooghly | Kolkata and the immediate hinterland, plus the same Bihar, Jharkhand and northeastern reach as Haldia | The upriver dock system of the same port authority, further from the sea and correspondingly more constrained on vessel size than Haldia. It remains a working container and general cargo gateway and is often the right answer for a Kolkata-area delivery, but for a larger parcel destined inland the Haldia docks or Paradip are usually the more realistic entry. |
For most commodities the ocean leg is the expensive part and the last mile is a rounding error. For bitumen into India the arithmetic inverts, and a buyer who compares two offers on the ocean freight alone is comparing the smaller half of the problem.
A tonne of paving binder is worth a small fraction of a tonne of most cargo that travels in a container and weighs exactly the same. Freight is therefore a large share of landed cost rather than a rounding error. The container arithmetic makes the point on its own, and it is worth stating precisely because it is routinely stated wrongly. A 20 ft box takes 80 steel drums and stops there, because eighty drums fill the floor pattern: 12 MT at a 150 kg fill, 14.4 MT at 180 kg and 14.8 MT at 185 kg. The same box loaded with 1 MT bags reaches 20 MT, which is the proof that the drum figures are a stowage limit and not a weight limit. Which limit actually binds therefore depends on the packing, and knowing which one you are up against is the difference between comparing two offers on tonnage and comparing them on nothing. What does not change is that bitumen is heavy for its value: a 40 ft container gives roughly twice the floor area of a 20 ft but not twice the permitted payload, so a dense cargo exhausts the weight allowance of the larger box before it fills the space. That is why the 20 ft box is the unit on this trade and why a 40 ft container is not the economy it looks like. It is also why every additional kilometre of road haulage bites harder on bitumen than on almost anything else in the same box.
From the Middle East, the ocean passage to India's west coast is one of the shorter deep-sea legs in the bitumen trade, and to the east coast it is longer but still measured against a subcontinent that is itself roughly three thousand kilometres from the northern frontier to the southern cape. The inland legs are not incidental. A cargo landed at Nhava Sheva for a project in Delhi has a road distance commonly cited at around 1,400 km ahead of it; the same project served through Mundra has around 1,100 km. A cargo landed on the west coast for a project in Odisha or Jharkhand has crossed the country. A cargo landed at Chennai for a project in Kerala has come round the cape when Cochin was on the way.
The consequence is blunt and it is the single most useful commercial fact on this page: for an inland Indian project, choosing the gateway is a larger financial decision than choosing the shipping line. A quotation expressed CFR or CIF at a port is a perfectly proper offer, and for a coastal project it is close to a delivered price. For a project several hundred kilometres inland it prices the part of the journey that is easiest to price and leaves the expensive part open. Any serious comparison of two offers has to be made at the same named place, or it is not a comparison at all. This is why the first question on an Indian enquiry is not grade or tonnage. It is where the material is actually being used.
Indian ports fall into two administrative families and the distinction is not academic. Major ports are administered under Union legislation; the older port trusts were reconstituted as port authorities under the Major Port Authorities Act, 2021, which is why documents refer to the Deendayal Port Authority where older ones said Kandla Port Trust, and why several ports carry names that changed while the berths did not. Non-major ports sit under state maritime boards — the Gujarat Maritime Board being the most consequential for this trade — and include several of the largest privately developed ports in the country.
For a buyer the practical difference is in flexibility and procedure rather than in geography: tariff setting, terminal arrangements, handling agreements and the commercial route to a facility are not the same in the two families. None of that is a reason to prefer one over the other. It is a reason to ask a forwarder how a specific gateway works for this commodity and this packing rather than assuming that a port is a port. And it is a reason to be sceptical of any claim that a particular port handles bitumen in bulk: heated tankage is a facility a specific operator either has and will contract for, or does not.
India moves a large share of its containerised import traffic inland by rail to inland container depots, and for a north Indian consignment that is frequently the difference between a viable delivered cost and an unviable one. Two dedicated freight corridors were built for exactly this traffic: a western corridor running inland from the Jawaharlal Nehru Port area toward the Delhi region, and an eastern corridor across the northern plains. Where a box is cleared — at the seaport or at an inland depot — changes the cost structure, the dwell behaviour and how quickly the container is emptied and returned. It is a forwarder question and a material one, and it should be asked before the gateway is fixed rather than after.
One caution belongs with it. Every transhipment is a handling event, and handling events are where drums get dented, seams get stressed and counts get disputed. A packing specification adequate for a single door-to-door road movement is not automatically adequate for a movement that is lifted three times. Record drum count, drum condition and seal numbers at every handover; a recorded count is what closes a quantity argument before it opens.
On a coastal delivery a container is emptied within a short distance of the port and returned. On a delivery to Delhi, Guwahati or Raipur the box goes inland with the cargo and has to come back, and the round trip is not measured in days. Shipping lines allow a contractually agreed period of free time and charge detention thereafter; the free period and the charge are commercial terms between the buyer and the line and no figures are stated here. The exposure is real enough that many inland Indian buyers strip the container at the port or at an inland depot and move drums onward on flatbed vehicles instead. That decision has to be made before the cargo is booked, because it changes the packing plan, the handling count and the insurance arrangement.
The northeastern states are reached from the rest of India through a narrow land corridor beside Siliguri, commonly cited as roughly twenty kilometres across at its narrowest. Every tonne of binder for Assam, Meghalaya, Nagaland, Manipur, Mizoram, Tripura and most of Arunachal Pradesh that arrives by sea at a Bay of Bengal port travels through it. That single fact does three things to a consignment. It makes the inland leg one of the longest in the country. It makes that leg weather-sensitive in a region whose monsoon is longer and heavier than the national one. And it removes the option of routing around a problem. A northeastern project should be planned as a pre-positioning exercise, with material inland before the rains rather than called off against a laying schedule, and the packing chosen for a journey with several handovers on it.
Under Incoterms 2020, FAS, FOB, CFR and CIF are rules for sea and inland waterway transport. They are built around a vessel and a port and they have coherent meaning for a parcel discharging at Nhava Sheva or Chennai. They have no coherent meaning for a truck arriving in Jaipur. The rules that work for any mode are FCA, CPT, CIP, DAP, DPU and DDP, and every one of them names a place. Three errors recur on Indian business:
The Incoterms for bitumen export page sets the rules out in full.
India makes conformity to an Indian Standard mandatory for a given product by notifying a Quality Control Order, after which the Bureau of Indian Standards administers the certification that proves it. Which products sit inside that net, and from which commencement date, is decided by notification and has been amended and deferred repeatedly. Whether such a requirement covers your bitumen product on your shipment date is therefore a question of fact to be checked rather than assumed, and this page does not state the answer. What follows is the structure of the mechanism and the order in which to solve it. It is not a substitute for advice from a licensed customs broker on the current position for your grade and your consignment.
Ask your customs broker, in writing, whether a mandatory quality-control requirement currently applies to the specific bitumen product you intend to import, which Indian standard it is tied to, what the commencement date is, and what evidence customs will expect at clearance. Requirements of this kind are introduced, amended, deferred and phased in by notification, so a status quoted in an article, remembered from a previous shipment or repeated by a counterparty is not a basis for a contract. Get the current position, dated, in writing, from someone accountable for it — and get it again if the shipment slips, because a deferral that was in force when you contracted may not be in force when you load.
The mechanism is worth understanding even if it does not currently reach your product, because it explains why the answer is a moving target. A Quality Control Order is a notification issued by the government department responsible for the product area, not by the standards body itself, which declares that goods of a defined description must conform to a named Indian Standard and must bear the Standard Mark under a licence from the Bureau of Indian Standards. The order names the product, names the standard, sets a commencement date, and usually carries exemptions — commonly for goods manufactured for export, for research and development quantities, and sometimes for defined transitional cases. Once such an order is in force, manufacture, import, sale, distribution and storage of non-conforming goods of that description are all caught, not merely the act of importing, and enforcement runs through both the standards body and the customs authority at the border.
A BIS licence to apply the Standard Mark is granted to a manufacturer, for a specific product, made at a specific works. It is not granted to a trader, an agent, an exporter of someone else's production or an Indian consignee, and it is not transferable from one refinery to another or from one works of the same company to another. Where the works is outside India the route is the Foreign Manufacturers Certification Scheme, and its shape is what a buyer needs to grasp: the overseas manufacturer applies in its own name; it nominates an Authorised Indian Representative resident in India who takes on defined responsibilities and liabilities on its behalf; a BIS team assesses the factory; samples are drawn and tested; a licence is granted for the named product, standard and works, carrying a unique licence number that appears alongside the mark; and the licence is then subject to ongoing surveillance, periodic renewal and fees including a marking fee. If a certification requirement applies to your product, this shapes who can supply you at all long before it shapes the paperwork.
Where a Standard Mark applies it is a marking obligation on the goods, which means it has to be settled before drums are filled and labelled rather than after the cargo is packed. A mark applied to a drum after the fact, or a mark applied by anyone other than the licensee, is not compliance. This is the single most common reason a certification requirement becomes a shipment-stopping problem rather than a paperwork problem: the decision point sits at the filling line, weeks before the decision point a buyer expects it at.
Even where no mandatory certification requirement reaches a product, Indian buyers routinely impose their own equivalent by contract, and it is worth being ready for it. The usual requests are a batch-specific Certificate of Analysis against IS 73:2013 with measured values, testing at a laboratory holding recognised national accreditation, a third-party inspection certificate from an internationally recognised inspection company covering loading and sampling, and retained sealed samples held by both parties. Meeting those is generally straightforward and is the fastest way to make an imported offer look as safe to a project engineer as a domestic one. Refusing them makes an offer look exactly as risky as the engineer already suspects it is.
Petroleum bitumen falls under HS heading 2713.20; the full Indian tariff subheading is confirmed by your broker. Then keep the goods description word for word identical across the sales contract, the letter of credit, the commercial invoice, the packing list, the bill of lading and the bill of entry. A description that drifts between documents is the most common self-inflicted cause of a hold. The classification and clearance mechanics, including how the description reaches the Bill of Entry and what happens when it does not match, are set out in full on the bitumen import to India page.
Write the test schedule into the contract: absolute viscosity at 60 °C in poise, kinematic viscosity at 135 °C, penetration, softening point, flash point, solubility, and viscosity ratio plus ductility on the RTFOT residue. Require a batch-specific Certificate of Analysis with real measured values, not a typical-values data sheet, and require the units to be stated. If the certificate arrives with TFOT results in place of RTFOT, the ageing requirement of the Indian standard has not been evidenced and no correlation factor closes the gap. Adding a test to a schedule before a batch is certified costs very little; commissioning it after a cargo is on the water costs a season.
Appoint an internationally recognised inspection company to attend loading, draw samples under supervision to IS 1201 or ASTM D140 across the consignment rather than from a single drum at the container door, and seal retained samples held by both parties. On a container load the cost is small against the value of the cargo, and it converts a disagreement about quality into a document both sides and their banks already recognise. On a cargo that will be hauled several hundred kilometres inland after discharge, it is the difference between an argument you can win and one you cannot — because a rejected parcel sitting at a project site in central India has no realistic reverse gear. See the bitumen sampling procedure.
Safety data sheet, certificate of origin from the chamber of commerce where origin affects duty treatment, packing list stating drum type and net weight with drum tare excluded, and packing specified explicitly as new steel drums where drums are used. Reconditioned drums are cheaper and are the single most common source of contamination disputes at an Indian discharge point. The full document set, and the letter-of-credit discrepancies each document generates, are covered on the companion import page rather than repeated here.
Before you contract, and again if the shipment slips, put these to a licensed customs broker in India and keep the dated reply on file. First: is this product, under this description and this tariff classification, subject to any mandatory certification or quality-control requirement on my intended shipment date? Second: if it is, which Indian Standard is it tied to, which certification route applies to an overseas manufacturer, and what must the manufacturer produce and by when? Third: what evidence will customs expect at the entry point I am actually using, and does anything about that answer change for the port or the packing I have chosen? This page names no currently appointed body and states no current scope, because scopes and appointments change and an undated assertion is precise enough for a buyer to plan a shipment on and wrong often enough to ruin one.
India does not have one construction season; it has several, and the gap between them is the most common planning error in bitumen supply to the subcontinent. The southwest monsoon makes bituminous laying impossible across most of the country from roughly June to September, which concentrates demand and shipment planning into the October to May window. But that national rule has three significant exceptions — the Tamil Nadu coast, the Himalaya and the northeast — and a supplier who applies it uniformly will get the timing wrong for a large part of the market.
| Region | Working paving season | Rain or shutdown window | Practical shipment consequence |
|---|---|---|---|
| North India — Punjab, Haryana, Delhi NCR, western Uttar Pradesh | October to June, with a slowdown at the peak of summer heat | Southwest monsoon roughly July to September; dense winter fog in late December and January disrupts night work and road haulage | Cargo landed August to October catches the post-monsoon push. Allow for the long inland leg from a Gujarat or Maharashtra port before committing to a laying date — the road distance from the west coast to the Delhi region runs from roughly 1,100 km through Mundra to roughly 1,400 km through Nhava Sheva. |
| West India — Maharashtra and Gujarat | October to May | Southwest monsoon roughly June to September, heaviest on the Konkan coast | Either land before the end of May or plan for September onward. A cargo arriving in July sits and pays storage, and in a Konkan yard it sits in the rain. |
| Central India — Madhya Pradesh, Chhattisgarh and Vidarbha | October to June, with the same hot-season slowdown as the north | Southwest monsoon roughly late June to September | The landlocked case. The gateway decision matters more here than anywhere else in India, because every option carries several hundred kilometres of inland haul and the difference between the best and worst choice is larger than the difference between two freight quotations. |
| North-west desert — western Rajasthan and Kachchh | October to March is comfortable; April to June is workable but severe | Limited monsoon rain, roughly July to September, but the summer heat is itself a working constraint and night working is common | The one region where the constraint is heat rather than rain. Storage in the open is the exposure to plan against, not the laying window — see the packing table below. |
| South-west — Kerala and coastal Karnataka | October to May | The monsoon makes landfall here first, around the start of June, and delivers the heaviest rainfall in the country | The earliest discharge cut-off in India. This is the region where a two-week slip in a sailing schedule costs a whole season. |
| Tamil Nadu and the southern Andhra coast | Roughly January to September | The northeast monsoon, October to December — the inverse of the national pattern | The October-to-May rule does not apply here. Shipping into Chennai or Tuticorin for an October start plans the cargo into the local rainy season. Note that the northern Andhra and Odisha coast takes the southwest monsoon as well as some northeast monsoon rain, so the inversion weakens as you move north up the coast and should not be applied to the whole eastern seaboard. |
| East India — West Bengal, Odisha, Bihar, Jharkhand | October to May | Southwest monsoon June to September, with Bay of Bengal cyclone risk in the pre-monsoon period and again from October to November | Berth delays at eastern ports cluster around cyclone events rather than spreading evenly. Build float into the discharge window rather than pricing a date you cannot control. |
| Himalayan states — Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh | Roughly May to October | Winter snow closes high-altitude work; the season is the inverse of the plains | Cargo has to be inland and stockpiled before the passes close. The binding constraint is the mountain road, not the port, and the grade is softer than anything the plains would order. |
| Northeast — Assam and the neighbouring states | November to April | A long monsoon, roughly May to October, with the highest rainfall totals in the country | The inland leg from Haldia or Kolkata through the Siliguri corridor is long and rain-sensitive, so the haulage has to be planned around the rains, not merely the laying. Pre-positioning under cover is the normal precaution here rather than a contingency. |
Most packing specifications are written against the voyage. For India the harder tests come after it, and there are two of them rather than one. The first is heat: a dark steel drum standing in an unshaded yard in Rajasthan or on a Gujarat quay in May is not in ambient conditions, and a VG-30 binder has a ring and ball softening point of at least 47 °C by specification, which is not a temperature an Indian pre-monsoon summer struggles to reach at the surface of a sun-exposed drum. The second is water: the monsoon, and the humidity of both coasts, put water where it does the most damage. Underneath both sits the length of the inland leg, which decides how many times the packing will be handled before anyone opens it.
| Format | Site loading figure per 20' FCL | What an Indian destination does to it | The storage and handling rule it creates |
|---|---|---|---|
| New steel drums, 150 kg net | 80 drums, 12 MT | The lightest of the standard drum fills and the one that carries the least head of softened material when a stack warms through. It is also the easiest to move at a site with no handling equipment, which describes a large share of Indian rural and state road packages | The format that tolerates a poorly equipped receiving site best, and the right default where the cargo is going a long way inland to a mobile plant. Store under cover, off the ground on dunnage, closures upward and tight, and keep the dwell short. Where drums must stand outside in the pre-monsoon heat, shade the stack; a tarpaulin is a cheap intervention against an expensive problem. |
| New steel drums, 180 kg net | 80 drums, 14.4 MT | More material per drum and a taller column of it, so a softened block carries more load onto the lower drums in a stack. The commonest visible symptom of a hot stack is distortion — bulging, leaning and stack instability — rather than an outright failure | Limit stack height in hot storage rather than applying a warehouse rule to an Indian yard in May, and inspect stacks after a heat spell rather than only on receipt. The tonnage per container is better than the 150 kg drum, so this is the sensible default where handling equipment exists at the receiving end. |
| New steel drums, 185 kg net | 80 drums, 14.8 MT | As the 180 kg drum, with the best container economics of the drum formats and correspondingly the least tolerance for hot, badly stacked storage | Choose it where the receiving site has proper handling equipment and covered storage, and not where drums will stand in the open through a pre-monsoon summer for an indefinite period. On a long inland leg with several handovers, the extra weight per unit is also extra strain on every lift. |
| Jumbo or poly bags, 1 MT net | 20 bags, 20 MT | The format the Indian climate punishes hardest, and it deserves a direct answer. A meltable-bag product depends on the block staying solid at ambient temperature. Where storage temperature approaches the softening point of the grade inside — 47 °C minimum for VG-30, 50 °C for VG-40 — the block loses shape, the bag slumps, adjacent bags adhere, and a stack that arrived as discrete units becomes a mass that cannot be separated cleanly | The container economics are the best available: 20 MT against 14.8 MT for the best drum. That is a genuine advantage and it has to be paid for with a covered storage plan and a short dwell between arrival and use. Where covered storage cannot be guaranteed, drums are the safer answer even at the worse loading figure. See jumbo bag bitumen. |
| Reconditioned drums | Nominally the same figures | Every problem above, plus the one that starts arguments. Reconditioned drums are the commonest source of contamination disputes in this trade anywhere in the world, and Indian humidity and heat accelerate corrosion of an already worked steel shell | Specify new steel drums in the contract, in words, not by implication, and say so on the packing list. On a market where the buyer has a domestic alternative and is choosing to import, a contamination dispute is not merely a commercial loss; it ends the relationship. See bitumen in new steel drums. |
| Bitutainer | Not containerised in the drum sense; commonly 20 to 25 MT | A heated tank in a container frame, which removes the drum handling and the drum disposal at a stroke. It is only useful where the receiving site can discharge it, and it introduces a piece of equipment that has to be returned or repositioned | Appropriate where a fixed plant can take a whole load and where the round trip for the unit has been agreed in advance. On a long inland leg it inherits every problem of a road tanker and adds an equipment logistics problem, so it fits short legs to equipped sites far better than long ones. |
| Bulk parcel by sea into shore tankage | Not containerised | Removes packaging cost, drum handling, drum disposal and the whole storage-in-the-sun problem with them. It is not a climate question but an infrastructure question | Requires a contracted receiving arrangement with a terminal that has heated storage for this product. That is a commercial arrangement with an individual operator and it can never be inferred from a port's name, size or the presence of oil handling there. Nothing on this page states that any Indian facility handles bitumen in bulk. Confirm in writing before a parcel is fixed. Where a movement is offered for carriage above 100 °C it falls to be classified as UN 3257, elevated temperature liquid, n.o.s., Class 9 under the UN model regulations; settle the documentation and equipment requirements with the carrier rather than after booking. See bulk bitumen supply. |
| The 20' container itself, standing at a port or a yard | 80 drums or 20 bags | A closed steel box in direct sun is a solar oven and its interior runs well above the shaded air temperature outside it. A box that sits through a long dwell in an Indian May subjects its contents to a more severe thermal history than the voyage did, and the contents cannot be inspected while it does so. In the monsoon the same box is a condensation trap | Treat dwell at the destination as a technical variable and not merely a demurrage cost. Plan the clearance so boxes are stripped promptly, ask the forwarder what dwell is realistic at the gateway you are using, and where a long dwell is unavoidable factor it into the packing and grade decision rather than discovering its effects at the plant. See containerized bitumen shipment. |
Viscosity grades under IS 73:2013: VG-10, VG-20, VG-30 and VG-40, classified by absolute viscosity at 60 °C in poise. VG-30 is the mainstream paving grade for most of the country, with an accepted band of 2400 to 3600 poise. VG-40, at 3200 to 4800 poise, is specified for highly stressed locations such as intersections, toll plazas, bus bays and truck lay-bys. VG-10 is largely a spray-application and emulsion or cutback feedstock grade, and VG-20 is a cold-climate and high-altitude grade that trades in comparatively small volume. Note that the viscosity requirement is a two-sided band rather than a floor, and that the bands do not tile the scale. A batch at 3800 poise is above the VG-30 ceiling of 3600 and so is not VG-30, though it does fall inside the VG-40 band. A batch at 1400 poise falls in the real gap between VG-10, which ends at 1200, and VG-20, which begins at 1600, and is in no grade at all. And VG-30 and VG-40 overlap between 3200 and 3600 poise, so a result in that window sits in both bands at once and the penetration minimum, the softening point and the kinematic viscosity are what decide the grade.
Not under that name, and not on that certificate. India procures against VG grades and 60/70 is a penetration grade under ASTM D946. A 60/70 binder clears VG-30's penetration minimum of 45 dmm easily and its typical softening point range of 49 to 56 °C clears VG-30's 47 °C minimum, but penetration is not the property that classifies an Indian grade. VG-30 requires absolute viscosity at 60 °C between 2400 and 3600 poise, and some 60/70 production reaches that band while some does not; the penetration certificate cannot tell you which, because penetration says nothing about temperature susceptibility. Four properties are simply missing from a 60/70 certificate: absolute viscosity at 60 °C, kinematic viscosity at 135 °C, and the viscosity ratio and ductility measured on the rolling thin-film oven residue. Commission all four on the batch that will actually load, before you contract. And note one arithmetic trap at the harder end: a genuine in-grade 60/70 measuring 49 °C softening point fails VG-40's 50 °C minimum outright.
Stiffness at service temperature. VG-30 is accepted between 2400 and 3600 poise absolute viscosity at 60 °C, VG-40 between 3200 and 4800, with correspondingly higher softening point minima (47 °C against 50 °C) and lower penetration minima (45 dmm against 35 dmm). VG-30 covers ordinary running lanes across the Indian plains and the peninsula. VG-40 is selected where traffic stands still, brakes or turns — intersections, toll plazas, bus bays, weighbridge approaches, container terminal pavements — because there the binder carries sustained shear at high temperature and rutting is the dominant risk. It is a traffic-loading decision rather than a climate decision, which is why it usually applies to defined sections of a contract rather than the whole of it. Do not treat VG-40 as a general upgrade: a stiffer binder is harder to compact, and a mix laid short of density is permeable, which is its own problem in a monsoon country.
S-65 is a superseded designation from IS 73:1992, when India graded by penetration. The number was the nominal penetration, giving a 60 to 70 dmm band, and the letter denoted the crude source within India: S for sources other than Assam, A for Assam petroleum. That letter has no meaning for imported cargo and never described a quality tier. Viscosity grading replaced the penetration designations when IS 73 was revised in 2006 and is carried into IS 73:2013, so treat the reference as a document written against a withdrawn edition, and ask the engineer to restate the requirement as a VG grade in writing — usually VG-30 — before the contract is signed. Where a tender names both a superseded designation and a current VG grade, which happens when a template has been only partly updated, resolve the contradiction in writing before submitting; a supplier who silently picks the one that suits him has accepted the risk of the one that does not.
Because IS 73:2013 assesses short-term ageing on the residue from the rolling thin-film oven test, to IS 9382 or ASTM D2872, and controls the viscosity ratio at 60 °C and the ductility of that residue. The thin-film oven test, ASTM D1754, ages a static film in a shallow pan at 163 °C for five hours; the rolling test ages a moving film in a rotating bottle at the same temperature for 85 minutes with an air jet directed into it, exposing fresh surface continuously. Those are different exposures and the results are not interchangeable, and there is no correlation factor that converts one into the other. The deeper point is that they report different kinds of number: TFOT practice reports a retained penetration or a loss on heating, while the Indian standard requires a ratio of the aged viscosity to the original viscosity, capped at 4.0. A certificate carrying TFOT results against a VG specification has not run the required procedure, and the number the specification actually asks for is absent rather than merely different.
The one closest to the project, not the one with the cheapest ocean freight. Bitumen is a low value density cargo — a 20 ft box of drums stops at 12 to 14.8 MT depending on the drum fill, because eighty drums fill the floor pattern, while the same box in 1 MT bags reaches 20 MT — so freight is a large share of landed cost and India's inland legs are long enough that the wrong gateway can add over a thousand kilometres of road haulage. Broadly: Mundra and Deendayal (Kandla) for Gujarat, Rajasthan and landlocked north India, with Mundra's rail links favouring the northern hinterland; Jawaharlal Nehru Port for Mumbai, Pune, Maharashtra and central India, and Mumbai Port alongside it; New Mangalore for coastal Karnataka and the Bengaluru corridor over the Ghats; Cochin for Kerala; Tuticorin for southern Tamil Nadu and Chennai or Kamarajar (Ennore) for northern Tamil Nadu and the Bengaluru corridor; Visakhapatnam for Andhra Pradesh, Telangana and Chhattisgarh; Paradip for Odisha; and Haldia or Kolkata for West Bengal, Bihar, Jharkhand and the northeast through the Siliguri corridor. On packing at those gateways, heated bulk storage exists at a number of Indian coastal locations but is contracted with terminal operators rather than being a default port capability, so confirm it before a bulk parcel is fixed. Without that arrangement, containerised packed cargo is the practical route and every major gateway handles it: 80 drums of 150 kg give about 12 MT per 20' FCL, 180 kg drums give about 14.4 MT, 185 kg drums about 14.8 MT, jumbo or poly bags 20 bags and about 20 MT, and a bitutainer 20 to 25 MT.
Yes, and this is where a single national answer breaks down. India contains four broad climate groups and the binder consequence differs across all of them. The humid tropical coasts, on both sides of the peninsula, are rutting-dominated with a serious moisture-damage overlay that is answered in the mix design and the aggregate rather than in the VG number. The tropical dry Deccan interior is the classic VG-30 case: hot summers, no winter worth writing a clause about, rutting as the unambiguous failure mode. The arid north-west is the hottest part of the country and pushes hardest toward the stiffer grades, but has genuinely cold winter nights underneath. The subtropical northern plains are the hardest case in India and also its most populous belt, because they combine summer maxima among the highest in the country with a real winter — January mean daily minima in Delhi are commonly cited around 7 °C, with cold waves and ground frost in parts of Punjab and Haryana — so the annual thermal cycle is far wider than anywhere in the peninsula, and reaching for the hardest available grade on the strength of June alone ignores half the year. The Himalaya is a different country again: the paving season runs roughly May to October, the inverse of the plains, freeze-thaw is a real pavement process, and the softer grades belong there. A standard export certificate carries no low-temperature line at all, so a project that wants one has to agree it in writing and commission it deliberately.
Bulk deserves a serious hearing in two situations and only two: a coastal or near-coastal delivery to a fixed hot-mix plant with heated tankage of adequate capacity, a compatible connection, a pump and the ability to take a whole load promptly, and a large permanent installation with its own storage. Everywhere else the argument runs the other way. A tanker holds temperature badly across a long Indian inland leg with standing time on it; a mobile plant on a rural package several hundred kilometres inland has no tankage at all; a damaged drum costs one drum out of eighty while a compromised bulk load costs the consignment at the far end of a very long haul; and drums allow staged call-off and heating one unit at a time, which is what a site fed at the end of a long leg actually needs. On the monsoon: the hazard is water rather than heat. Drums are filled hot and the block shrinks as it cools, leaving a shallow depression in the top head that collects rain and condensate; when a drum with water sitting on the block is charged into a melter, the water flashes to steam under a layer of hot bitumen and the result is violent foaming and boil-over. Store drums closures uppermost and tight, off the ground on dunnage and under cover, check the head before charging, and specify new steel drums in the contract in words rather than by implication. Heat is a separate problem in the pre-monsoon summer: a VG-30 has a softening point of at least 47 °C by specification, which a sun-exposed steel drum in Rajasthan or Gujarat reaches, and the predictable results are drum distortion and stack instability rather than product damage.
That turns on whether a Quality Control Order covering your specific bitumen product is in force on your shipment date, and this page deliberately does not state that. India brings a product inside the mandatory certification net by notifying such an order against a named Indian Standard, which the Bureau of Indian Standards then administers, and the scope and the commencement dates have been amended and deferred repeatedly. Confirm the current position for your specific product, and the evidence customs will expect, with a licensed customs broker before you contract — not from a remembered figure or an undated article. Where a BIS licence is required, note the structural points, because they decide who can supply you at all rather than merely what paperwork is needed. The licence is granted to a manufacturer, for a specific product, at a specific works, through the Foreign Manufacturers Certification Scheme where the works is outside India. It requires an application in the manufacturer's own name, the nomination of an Authorised Indian Representative resident in India, a factory assessment, sample testing, and thereafter ongoing surveillance, renewal and fees. A trader or an Indian consignee cannot obtain it on the manufacturer's behalf, it does not transfer between refineries, and where a Standard Mark applies it is a physical marking obligation that has to be settled before drums are filled rather than after the cargo is packed.
For most of India the southwest monsoon stops bituminous laying from roughly June to September, so demand and planning concentrate on the October to May window and cargo is best landed either before the end of May or from September onward. Three exceptions matter. Tamil Nadu and the southern Andhra coast get their main rain from the northeast monsoon between October and December, so an October arrival there plans the cargo into the local rainy season — though note the inversion weakens as you move north up the coast, because the Odisha and northern Andhra coast takes the southwest monsoon as well. The Himalayan states work from roughly May to October, the inverse of the plains, with cargo needing to be inland before the passes close. And the northeast has a longer, heavier monsoon running roughly May to October, with an inland leg through the Siliguri corridor that is itself rain-sensitive, so material there is pre-positioned rather than called off. Add the pull of the Indian financial year, which ends on 31 March and concentrates public-project demand into January to March, tightening inland trucking availability in exactly those weeks. Finally, remember that the discharge window and the laying window are not the same window: material landed early has to be stored somewhere dry, and in a monsoon country that is a real cost and a real risk.
Send the VG grade, tonnage, packing, destination port and Incoterm, and name the town where the material will actually be used rather than the state — on a cargo this heavy the inland leg moves the delivered cost more than the sea freight does. State whether the project specification references an IRC clause or a MoRTH section, and attach it if you have it: the offer will be checked against it line by line, including the absolute viscosity at 60 °C and the RTFOT residue requirements, which are the two lines most likely to decide acceptance. Contact is by WhatsApp on +971 56 144 5733.