Bitumen 30/45: EN 12591 Specification, Applications and Export Supply

As with every penetration grade, the name is a measurement rather than a brand or a quality claim. A sample is conditioned to 25 °C, a standard needle carrying a 100 g load is released into it for five seconds, and the depth reached is read off in tenths of a millimetre. Any result between 30 and 45 makes the material a 30/45. The method is EN 1426, which is technically equivalent to ASTM D5 and IS 1203; European practice writes the unit as ×0.1 mm where American practice writes dmm. Same test, same number, different house style.

Because a lower penetration means a stiffer binder, 30/45 sits near the hard end of the EN 12591 ladder — one step below 35/50, one step above 20/30, and two full steps harder than the 50/70 that most of Europe paves with. Its softening point band by EN 1427 is 52 to 60 °C, which is eight degrees above the 46 to 54 °C band of 50/70 at both ends. That single comparison is the character of the grade: it stays stiff at temperatures where a mainstream paving binder has begun to flow, and it turns brittle at temperatures where a mainstream paving binder is still ductile.

What a hard grade buys, and what it costs

A binder is chosen for the failure mode that governs the pavement, not for a general idea of quality. Where the governing distress is permanent deformation — rutting in channelised wheelpaths, shoving at junction approaches, slow heavy axles on a port access road, a climate that holds the pavement above 50 °C for weeks at a time — a stiffer binder raises the modulus of the mixture and resists that deformation. In high-modulus base design the argument goes further than durability: a stiffer base layer carries the same design traffic in less thickness, which is a structural and material saving rather than a cosmetic one, and it is the reason hard grades exist as a family at all.

The cost is paid at both ends of the temperature scale, and it is real. At the cold end, the stiffness that resists rutting also resists relaxation, so the binder cannot shed thermal stress by flowing and low-temperature cracking arrives earlier. EN 12591 records this directly in the specification: the Fraass breaking point limit for 30/45 is a maximum of -5 °C, against -8 °C for 50/70. The harder grade is permitted to become brittle three degrees warmer. At the hot end, the binder needs more heat to coat aggregate and more heat to remain workable behind the paver, which narrows the compaction window and raises the energy, the plant discipline and the paving-team discipline the job demands. Both consequences are set out in full further down this page, because a grade page that lists only the advantages of its grade is a sales page rather than a reference.

What EN 12591 obliges the producer to prove

The value of buying to a European standard rather than to a data sheet is that the standard names the tests. For 30/45, EN 12591 controls four things that an ASTM-based export certificate typically does not:

• Ageing by RTFOT, not TFOT. Resistance to hardening is assessed by the rolling thin-film oven test to EN 12607-1, and three separate limits are placed on the aged residue — change of mass, retained penetration and softening point after hardening.
• A Fraass breaking point. EN 12593 measures the temperature at which a thin film of binder cracks when it is cooled and flexed. ASTM D946 contains no low-temperature requirement of any kind, so this line exists only if the order asks for it.
• Solubility in toluene. EN 12592 uses toluene where ASTM D2042 uses trichloroethylene. The limit is the same 99.0 %, but the solvent is not, so a laboratory reporting solubility in trichloroethylene has not run the European method.
• A flash point set by the standard. EN ISO 2592, Cleveland open cup, with a minimum of 240 °C for this grade — ten degrees above the minimum EN 12591 sets for 50/70, because the harder grades are handled hotter.

All four are checkable on a Certificate of Analysis. If a supplier offers 30/45 and the certificate carries only penetration, softening point, ductility and trichloroethylene solubility, that document is not evidence of EN 12591 conformity. It is an ASTM-style data sheet with a European grade name typed at the top.

Why this page spends so long on the number 30/40

More enquiries reach this grade under the wrong name than under the right one. 30/40 is one of the most heavily traded designations in the hard-grade market and it is not a grade in any standard — not in ASTM D946, which names five grades and stops, and not in EN 12591, which names nine and does not include it. A buyer who writes 30/40 is usually reaching for exactly what EN calls 30/45, and the whole of the intended band except its top five tenths of a millimetre sits inside the EN band. But a contract that says 30/40 has no limit table behind it, and that is a commercial exposure rather than a pedantic point. The section headed The 30/40 problem below sets out what happens to an order written that way, and what to write instead.

Penetration and softening point, read as a pair

These two properties describe consistency and they travel together. For a straight-run 30/45 the ring and ball softening point normally lands between 52 and 60 °C, and for a given crude and process route the two track each other predictably. A certificate reporting, say, 38 ×0.1 mm penetration alongside a softening point of 66 °C is not a superior 30/45. It is out of grade, and it is a signal that the material may have been air-blown or blended rather than produced as a straight-run paving bitumen. On hard grades this check earns its keep more than anywhere else on the ladder, because air-blowing is the cheapest way to make a soft feedstock look hard on a penetration test, and blowing raises softening point far faster than it lowers penetration. Read the two numbers together, never separately.

The pairing can be quantified without any extra testing. The penetration index, from the Pfeiffer and Van Doormaal relation, uses only penetration P in dmm at 25 °C and ring and ball softening point T in °C: A = (log 800 – log P) / (T – 25), and PI = (20 – 500A) / (1 + 50A). Straight-run paving bitumens normally compute to somewhere between -1 and +1. A hard-grade certificate that computes well above +1 is describing a blown or heavily blended material, whatever the grade name says, and blown material behaves differently in fatigue and at low temperature even when it satisfies both bands. The penetration index is an engineering consistency indicator rather than a requirement of EN 12591, but it costs nothing and it uses two numbers you already hold.

The Fraass breaking point, and why it matters more as the binder hardens

The Fraass breaking point is measured to EN 12593. A thin film of binder is spread on a small flexible steel plaque, cooled at a controlled rate of one degree per minute and flexed once every minute. The temperature at which the film first cracks is the Fraass breaking point. For 30/45 the EN 12591 limit is a maximum of -5 °C. Being a maximum, a more negative result is a better result.

Compare that with the limit the same standard sets for 50/70, which is -8 °C. The standard is not being careless with the hard grade; it is acknowledging what hardness does. A stiffer binder relaxes stress more slowly, so when a pavement contracts on a cold night the tensile stress that builds in the mat cannot be shed by flow and has to be carried by the binder film. The temperature at which that film gives up is what Fraass approximates. On a 160/220 the number sits so far below any realistic pavement temperature that it rarely governs anything. On a 30/45 it sits only five degrees below freezing, and the difference between a cargo that measures -5 and a cargo that measures -9 is the difference between a binder that is marginal in a continental winter and one that has some room. This is why a property that is optional in the structure of EN 12591 is close to essential in the purchase of a hard grade.

Two honest qualifications belong here. Fraass is an empirical brittleness index run on a thin film, not a fundamental rheological measurement, and it has a modest reputation for reproducibility between laboratories. Low-temperature behaviour is measured far more precisely by the bending beam rheometer that underpins performance grading, and where a project is large enough for thermal cracking to be the design question, a BBR result on the actual binder is worth more than a Fraass result. But Fraass is what EN 12591 names, it is what a European engineer will look for, and it is the single line most often missing when an ASTM-supplied cargo is offered against a European hard-grade specification, because nobody runs it unless it was ordered.

RTFOT, and what 53 % retained penetration means in numbers

Resistance to hardening is judged by the rolling thin-film oven test to EN 12607-1. Both this and the American thin-film oven test run at 163 °C and both answer the same question — how much does this binder harden during hot mixing — but they are different tests. TFOT (ASTM D1754) ages a static 3.2 mm layer in a shallow dish, which skins over and shields the material beneath it. RTFOT (EN 12607-1, equivalent to ASTM D2872) ages a continuously renewed film inside rotating glass bottles with an air jet. The residues are not the same, and a European engineer is entitled to reject a TFOT result offered against an RTFOT requirement.

EN 12591 then places three limits on the residue rather than one. Change of mass is capped at ± 0.5 % — note the plus-or-minus, because a binder can gain mass through oxidation as well as lose it through volatilisation. Retained penetration must be at least 53 % of the original, which is a tighter requirement than the 50 % applied to 50/70. And the softening point after hardening must be at least 54 °C.

Put numbers on the retained penetration line, because it is the one buyers misread. A cargo entering the test at 40 ×0.1 mm must still measure at least 21 afterwards. A cargo entering at the bottom of the band, 30, must still measure at least 16. Those aged values sit below the 20/30 band, and that is the real warning the RTFOT line carries on a hard grade: the binder that comes out of the mixer is materially harder than the binder that arrived at the plant, and the binder in the pavement after ten summers is harder still. A grade that is already at -5 °C on Fraass when fresh has very little room to give. This is why hard-grade mixes are designed with attention to binder film thickness and low in-place air voids rather than on stiffness alone, and why field ageing, not the certificate, is what eventually decides a hard-binder pavement.

Flash point: 240 °C, and why the extra ten degrees are not spare

EN 12591 sets a minimum flash point of 240 °C for 30/45 by Cleveland open cup to EN ISO 2592, against 230 °C for 50/70. It is tempting to read the extra ten degrees as extra safety margin. It is not. It is the standard tracking the fact that a hard grade is stored, pumped and mixed hotter than a soft one, so the gap between working temperature and flash point stays roughly where it was. If your handling practice puts the binder at 175 to 180 °C rather than the 150 to 165 °C a 50/70 needs, you have already spent the margin the higher flash point gave you. Build the safety case on the number printed on your own Certificate of Analysis and on your actual tank and mixer temperatures, not on the impression that a harder grade is intrinsically safer.

Solubility: same limit, different solvent

Solubility confirms the material is genuine bitumen and has not been extended with mineral filler or a foreign residue. EN 12592 sets a minimum of 99.0 %, identical to the ASTM D2042 limit, but determines it in toluene rather than trichloroethylene. A genuine paving bitumen passes both. The point is documentary rather than physical: if the contract says EN 12592 and the certificate says trichloroethylene, the laboratory has run a different method, and an inspecting engineer working to a European specification can say so. On hard grades the test carries a second use, because extension with filler is one of the crude ways a soft binder is made to test hard, and a solubility figure drifting below 99.0 % is the cheapest evidence of it.

What EN 12591 leaves out, and what a hard-grade buyer should add

Three lines that a Gulf-style certificate always carries are simply not in EN 12591: ductility, water content and density. That is a drafting decision rather than a gap. The European committee chose to control cohesion through the softening point window and the three RTFOT limits rather than through how far a briquette stretches before it snaps. Density is a special case — absent from the requirement list but present on nearly every producer data sheet, because converting invoiced tonnes into tank volume at discharge depends on it.

Two additions are worth writing into a hard-grade purchase order even though EN 12591 does not demand them of every cargo. The first is the Fraass breaking point by EN 12593, for the reasons above. The second is kinematic viscosity at 135 °C by EN 12595, because that is roughly the temperature at which the binder has to coat aggregate, and it is the number that tells your plant whether the mixing temperature in the mix design is achievable with the material actually being supplied. Neither test is expensive. Neither is run by default. Both have to be in the order before production. The procedures behind each specification line are set out in the bitumen test methods reference.

Start with what the two standards actually contain. ASTM D946 names exactly five penetration grades — 40-50, 60-70, 85-100, 120-150 and 200-300 — and AASHTO M20 names the same five. There is no ASTM 30/40, and there is no ASTM 20/30 either, whatever the heading on a data sheet may say. EN 12591 names nine: 20/30, 30/45, 35/50, 40/60, 50/70, 70/100, 100/150, 160/220 and 250/330. There is no EN 30/40. The designation belongs to neither system, and the page this site already publishes on 30/40 says exactly that.

So where does the name come from? From the arithmetic habit of the ASTM series, where bands span ten units and are written as two round numbers. 40-50, 60-70 and 85-100 all read that way, and a trader wanting something one step harder than 40-50 wrote 30/40 because it looked like the next entry in a series that had in fact already ended. The name then propagated through price lists, enquiry forms and broker emails for decades, and it now arrives on the desk of people who have never had reason to check whether a standard stands behind it.

What the buyer usually means

In practice, a buyer who asks for 30/40 is nearly always reaching for a hard binder for a heavy-duty base or binder course, and the defined grade that lands closest is EN 12591 30/45. The intended band 30 to 40 sits entirely inside 30 to 45; the two differ only in that EN admits material between 40 and 45 as well. Read the other way, a 30/45 cargo measuring 42 ×0.1 mm satisfies EN 12591 completely and sits outside what the buyer wrote down. That is the whole practical content of the difference, and it is worth understanding rather than arguing about, because it decides which of the two failure modes below you are exposed to.

What actually goes wrong with a contract that says 30/40

Three distinct things, and only the first is obvious.

• There are no acceptance limits. A specification is a list of properties, methods and limits. 30/40 supplies a penetration intent and nothing else — no softening point band, no Fraass limit, no ageing requirement, no flash point, no solubility, no method references. If a cargo arrives at 39 ×0.1 mm with a softening point of 63 °C and no RTFOT data, it has not breached anything, because nothing was specified. The buyer’s remedy in that situation is not weak; it is absent.
• Both parties fill the blank differently, in good faith. The seller reads 30/40 as a commercial description and supplies against a house data sheet. The buyer reads it as a specification and expects the destination engineer to accept it. Neither has misbehaved, and the disagreement surfaces at the discharge port, which is the most expensive place for it to surface.
• The band edge becomes the argument. Every test method publishes a precision statement giving repeatability within one laboratory and reproducibility between two. A cargo whose true penetration is near 40 can report 39 at load and 42 at destination with neither laboratory wrong. Under 30/45 that spread is a non-event, because both results are in grade. Under an undefined 30/40 it becomes a dispute with no standard to settle it. ASTM D3244 is the published practice for combining a supplier result and a receiver result into an assigned test value using the precision statement of the method concerned, and naming it in the contract converts that argument into a calculation — but it can only be applied to a limit that exists.

What to write instead

If the project is European, or the specification is drawn from European practice, write the grade and the standard together and then write the test suite out in full. A workable form is: bitumen, paving grade 30/45 to EN 12591; penetration at 25 °C by EN 1426, 30 to 45 ×0.1 mm; softening point by EN 1427, 52 to 60 °C; Fraass breaking point by EN 12593, maximum -5 °C; flash point by EN ISO 2592, minimum 240 °C; solubility in toluene by EN 12592, minimum 99.0 %; resistance to hardening by EN 12607-1 with change of mass, retained penetration and softening point on the residue reported; quality and quantity as determined by an independent surveyor at the load port. Every line carries a method, and every one of them is something the destination laboratory can repeat.

If the buyer’s own intent really is a ceiling of 40 rather than 45 — because a mix design was closed on a stiffer binder, or because a national annex narrows the band — then the way to get it is not to invoke a grade that does not exist. It is to buy 30/45 to EN 12591 and add a contractual sub-band: penetration at 25 °C by EN 1426, 30 to 40 ×0.1 mm, as an additional contractual limit within the EN 12591 30/45 grade. That sentence gets the buyer exactly what 30/40 was reaching for, keeps the whole EN limit table underneath it, and is enforceable because every term in it is defined somewhere. Expect it to narrow the field of available cargoes and to be reflected in price, which is the honest consequence of a tighter requirement rather than a reason to avoid stating it.

If the project is not European

Then the first question is not which grade to buy but which standard the project specification names. A request for a hard binder written in ASTM language has a problem the grade name cannot solve, because ASTM D946 stops at 40-50 and has nothing harder. There are three defensible routes. Buy to EN 12591 and accept that the acceptance testing will be European. Buy a defined ASTM grade and accept that 40-50 is the hardest the standard offers. Or, for material harder than 20/30, look at EN 13924-1, which specifies hard paving grades 15/25 and 10/20 separately from EN 12591. What is not defensible is writing an undefined name into a contract and settling the meaning later. The grade equivalence reference sets out the wider cross-system picture, including which commonly traded names have no standard behind them.

Any climate where low-temperature cracking, not rutting, decides

This is the governing case and it deserves to be stated first. If the pavement’s design life will be ended by transverse thermal cracking rather than by permanent deformation, a hard binder is the wrong instrument and no amount of mix design will rescue it. EN 12591 permits a 30/45 to reach its Fraass breaking point at -5 °C. A continental winter, a high-altitude route, a northern European or Central Asian site with regular sub-zero nights will take the pavement below that. The binder film then cannot relax the tensile stress that builds as the mat contracts, the mat cracks transversely, water enters, and the cracking propagates through freeze-thaw cycling into a maintenance problem that costs more than the rutting ever would have.

The tell is in the design temperatures, not in the traffic count. Ask what the minimum pavement temperature at the site is, and how far below the Fraass limit it goes. Where the answer is anywhere near -5 °C, move down the ladder — to 35/50, to 40/60, or to 50/70 — or move sideways to a polymer modified binder that can deliver high-temperature stiffness without the low-temperature penalty. A hard binder in a cold climate is the most expensive mistake on this page, because it fails structurally rather than cosmetically and it fails in the third or fourth winter, long after everyone has been paid.

Thin layers, surface dressing and spray-applied work

Thin surfacings live and die on flexibility, adhesion and the ability of the binder film to follow movement in the layer underneath. A hard binder gives up all three. It is also unsuitable for surface dressing and spray sealing on simple physical grounds: the binder has to be sprayed at a controlled rate through a distributor bar and then has to wet and hold chippings under traffic, and a 30/45 is too viscous to spray at reasonable temperatures and too brittle to retain chippings through a winter. Where those applications call for a straight binder, the ladder runs the other way — 100/150, 160/220 and softer — and in most markets they call for an emulsion or a cutback rather than a straight binder at all.

Emulsion and cutback feedstock

Cationic bitumen emulsions for tack coats, prime coats, slurry seals and surface dressing are normally made from soft base binders, because the residual binder left after the emulsion breaks has to remain flexible in a very thin film. A 30/45 is the wrong feedstock, and the same logic applies to cutbacks. If your enquiry is really about tack coat or prime coat, this grade is not the answer to it.

Fatigue-critical pavements on weak or cracked support

A stiff layer over a weak foundation is a bending problem. Where the subgrade or the existing pavement deflects under load, the new layer takes the strain in tension at its underside, and a hard binder reaches its fatigue limit sooner than a softer one at the same strain. Reflective cracking over an existing cracked pavement is the same mechanism seen from above: the crack below opens and closes with temperature and traffic, and a stiff overlay transmits that movement to its own surface instead of absorbing it. Thin pavements on weak subgrade, rural roads with limited structure and overlays on badly cracked pavements are all cases where the correct move is a softer binder, a modified binder or an interlayer — not more stiffness.

The workability cost, and what it does to the compaction window

This is the practical reason hard-grade jobs go wrong on site rather than in design. Viscosity at any given temperature is higher for 30/45 than for a mainstream paving grade, so every operation that depends on the binder flowing needs more heat: the storage tank, the pump, the mixer, the paver and the roller train. In common industry practice, and not as any requirement of EN 12591, that means mixing in the region of 160 to 180 °C where a 50/70 would be mixed at 150 to 165 °C, and starting compaction at 150 to 165 °C where a 50/70 starts at 140 to 150 °C.

The consequence is not that everything simply shifts up by fifteen degrees. It is that the window closes from below. Compaction has to be finished before the mix stiffens past the point where the rollers can still move aggregate, and for a hard binder that cut-off arrives at a higher temperature — commonly quoted in practice as somewhere above about 110 °C, against 90 to 100 °C for a 50/70. So the mat starts hotter and becomes unworkable sooner, and the usable interval between the two is shorter in minutes than it is for a softer grade even though it is wider in degrees. Four site conditions eat that interval fast, and any of them is a reason to question the grade before the plant is booked:

• Long haul from plant to site. Every minute in the truck is a minute of the compaction window spent. Hard-grade work is intolerant of a long or unreliable haul in a way that 50/70 work is not.
• Cool, windy or wet weather, and night paving. Layers lose heat to the substrate and to the air, and a hard binder has less time to give. Many specifications impose minimum ambient and substrate temperatures for hard-grade laying for exactly this reason.
• Thin lifts. Layer thickness is what buys cooling time. A hard binder in a thin lift is the worst combination for compaction, and it is also the combination in which a hard binder makes the least engineering sense.
• Hand-laid areas, joints and detail work. Around ironwork, in bays, at joints and anywhere a paver cannot reach, a hard mix goes cold before it can be worked. Density is then lost precisely where water will later get in.

Compaction is not a finishing operation; it is where the mixture’s design properties are realised. A hard binder that is under-compacted delivers neither the stiffness it was bought for nor the durability of the softer grade it replaced. It delivers high air voids, accelerated ageing through those voids, and early cracking. If the site cannot hold the window, the honest answer is a different grade or a warm-mix additive package, not a heavier roller pattern. The heating temperature guide and asphalt mix design basics cover both sides of this in more detail.

Where the specification names a softer grade

Substituting upward in hardness because a harder binder sounds stronger is a common and expensive error. A specification that names 50/70 has usually been written against a climate, a layer thickness and a construction method, and supplying 30/45 against it changes the mixture’s low-temperature behaviour, its fatigue life and its compaction requirements at once. Substitution in either direction is the specifying engineer’s decision, in writing, before shipment, naming the substituted grade and its standard rather than approving a concept.

Where the requirement is actually an industrial grade

One further mismatch is worth naming because it recurs. Enquiries for a hard bitumen sometimes turn out to describe roofing felt, waterproofing membrane, pipe coating or a similar industrial use. Those applications call for oxidized grades, designated by softening point and penetration together, and they are a different product family with different specifications and different handling. A paving grade selected only because its penetration number is low will not do that work. If the end use is not a road, the answer is not on this page.

Name the methods, not just the grade

The single most effective thing a buyer can do is write the test methods into the purchase order. An order that says Bitumen 30/45 invites a data sheet built around ASTM methods with a European grade name at the top. An order that says Bitumen 30/45 to EN 12591, batch Certificate of Analysis to report penetration by EN 1426, softening point by EN 1427, Fraass breaking point by EN 12593, flash point by EN ISO 2592, solubility in toluene by EN 12592, and RTFOT residue to EN 12607-1 with change of mass, retained penetration and softening point after hardening leaves nothing to interpretation. Every line in that sentence is a line the destination engineer will look for, and none of them can be added retrospectively to a cargo that has already loaded.

Put Fraass and RTFOT into the inspection scope, in writing

A standard quality-and-quantity scope from an independent surveyor covers penetration, softening point and the quick lines. A Fraass determination, and a full RTFOT followed by penetration and softening point on the residue, are extra laboratory work measured in days rather than hours. If they are not in the inspection order and in the production plan, they will not appear on the report — and that, rather than any failure of the binder, is the usual reason an otherwise sound European cargo arrives with an incomplete certificate. On a hard grade the Fraass line is the one worth insisting on, because it is the property that determines whether the binder suits the destination climate and it is the property no ASTM-based producer runs by default.

Read the certificate as a batch document, not a template

Insist on measured, batch-specific figures traceable to the parcel being shipped. A certificate whose values land on the same round numbers every time is a template rather than a test report. Then run the two-number check described earlier: compute the penetration index from the reported penetration and softening point and see whether it lands in the range a straight-run binder occupies. On hard grades this is the most useful authenticity check available for free, because air-blowing is the cheapest way to make a soft feedstock report a low penetration, and blowing shows up as a softening point too high for the measured penetration.

Size the retained samples for the tests the argument will turn on

A result is only defensible if the sample behind it traces to the cargo, so have retained samples drawn and sealed in the inspector’s presence and held by both parties for an agreed period after discharge. Then size them for the standard you are actually buying to. Rechecking penetration and softening point consumes very little material; re-running an RTFOT and then testing penetration and softening point on the residue, plus a Fraass determination, consumes a great deal more. Agree the retained quantity in the contract rather than discovering at dispute stage that the sealed tin will not stretch to the two tests the disagreement depends on. Where the cargo is drummed, require sampling across the whole load rather than from whichever drum sits nearest the container door.

Packing, and the loading figures behind it

Packing sets the container count, the handling plant needed at discharge, the waste disposal burden and how quickly the cargo can be put to work, so it moves landed cost more than most buyers expect. The figures are governed by the packaging rather than by the grade, and this site works to the following standard loadings:

• New steel drums, 150 kg net: 80 drums and 12 MT in a 20-foot container.
• New steel drums, 180 kg net: 14.4 MT in a 20-foot container.
• New steel drums, 185 kg net: 14.8 MT in a 20-foot container.
• Jumbo or meltable poly bags, 1 MT each: 20 bags and 20 MT in a 20-foot container.

Exact counts vary with drum dimensions, container type and destination axle weight limits, and the logistics and shipping page sets out the options in full. Two points are worth writing into the contract whatever the packing. Specify new drums: reconditioned drums are cheaper and are the single most common origin of contamination claims at discharge. And confirm that drum tare is excluded from the invoiced net weight, so that the tonnage on the invoice is tonnage of binder.

What is specific to a hard grade in packing and discharge

Hard grades reheat more slowly and less forgivingly than mainstream paving binders, and that changes the packing decision rather than merely complicating it. Drummed 30/45 has to be brought back to a working temperature well above what a 50/70 needs, and the temptation on site is to apply heat faster than the drum wall can conduct it, which is exactly how binder is carbonised and drums are ruined. Where the receiving plant has heated storage and a decanting facility, bulk or tank container delivery avoids the problem entirely and makes the European test suite easier to evidence as well, because a bulk parcel is sampled from the tank rather than from a scatter of drums. Where drums are unavoidable, plan the melting arrangement before the container arrives rather than after, and allow realistic time for it in the laying programme.

The commercial file

The document set is the same as for any bitumen shipment: commercial invoice, packing list, bill of lading, Certificate of Origin from the chamber of commerce, Technical Data Sheet, Safety Data Sheet and the batch Certificate of Analysis. Where the destination sits inside the European Union or the EEA, EN 12591 also does duty as the harmonised standard behind CE marking and the Declaration of Performance under the Construction Products framework. That paperwork is generated at the producing plant through initial type testing and factory production control, it travels with the product, and it answers a different question from whether the binder meets the numbers in the specification table. If your destination is inside that area, establish before committing tonnage who issues the Declaration of Performance for the material you are buying and what obligations attach to the party named on the import, taking the position from your importer, your customs broker or the relevant national authority rather than from a supplier’s assurance. In the many markets outside that area that specify EN 12591 purely as a technical standard, no CE obligation arises and the Certificate of Analysis against the EN methods is what the engineer needs.

Material for this grade is supplied from the Middle East. Quantity, packing, destination port and Incoterm are what determine an offer, and any property your specification requires beyond the EN 12591 table should be named in the enquiry so that it can be arranged at production rather than discovered at discharge.