Bitumen Supply to Southeast Asia

A supplier who has sold into two or three of these countries will notice something reassuring: the grade names repeat. 60/70 appears in Vietnamese, Malaysian, Indonesian, Thai and Cambodian documents. 80/100 and 85-100 appear in several of them too. It is tempting to conclude that the region runs on one specification with local accents.

It does not. What the region shares is a classification method — penetration at 25 °C — not a specification. Behind each of those familiar numbers sits a different national acceptance document, written by a different body, listing a different set of property lines, and in two cases controlling a property that ASTM D946 does not mention at all. A batch certificate that satisfies one of them may simply be silent on the line the next one is going to check.

What the region genuinely has in common

Three things, and they are worth stating precisely because they are the only things that generalise:

• There is no cold season anywhere in it. The region runs from roughly 11° south to 23° north. Binder selection is driven almost entirely by the high-temperature end of the specification and by moisture damage. Low-temperature cracking is not a design case in any of these six markets.
• It rains a great deal, all year, on pavements that never fully dry out. That makes adhesion and stripping resistance the recurring technical complaint across every one of them, and it is why the region's engineers ask a different set of questions from the ones a Gulf or Central Asian buyer asks.
• Penetration grading is the commercial language. No market in the region has moved wholesale to performance grading for conventional paving, although performance classes appear in modified binder requirements. An offer written in penetration terms will be understood everywhere here.

What does not generalise

Everything that actually decides a transaction. The document the project procures against, the grade the engineer will name, the port the cargo can realistically discharge at, the inland leg from it, the conformity route at the border, and the months in which paving can physically happen are all national questions with national answers. A shipment plan built for Port Klang is wrong for Davao in every one of those respects, and wrong for Phnom Penh in ways that are not obvious until the cargo is on the water.

What this page does

This is a hub. It gives you the regional physics, the comparison you need to work out which market you are actually dealing with, and the routing to the country page that carries the detail. It deliberately does not restate those pages, and it does not replace your customs broker, whose job is to confirm the current requirement for your destination, your commodity and your shipment date.

Axis one: does the cargo stop moving when it reaches the first port?

In four of these six markets the port of discharge is routinely not the destination, and in three of them the leg that follows is another vessel rather than another truck. That is a different planning problem from a long drive, because it needs a berth, a service, a flag and a second set of handling equipment, and because it normally travels on a separate contract of carriage.

• Indonesia is an archipelago, commonly cited at more than seventeen thousand islands, with the road programme spread across Java, Sumatra, Kalimantan, Sulawesi, the Nusa Tenggara chain and Papua. A box landed at Tanjung Priok for a Sulawesi or Kalimantan project has a domestic sea leg in front of it, not a domestic road leg.
• The Philippines is an archipelago, officially given as 7,641 islands, administered in three island groups — Luzon, the Visayas and Mindanao — with no land route between any two of them. A Manila discharge for a Davao project is not a long haul. It is the wrong port.
• Malaysia is not an archipelago but it is split, and the split is sharper than most buyers expect: Peninsular Malaysia and the Borneo states of Sabah and Sarawak face each other across the South China Sea. The crossing is a customs boundary as well as a sea one, which is why a movement from the Peninsula to Sabah or Sarawak is declared on its own form rather than simply trucked and shipped.
• Vietnam is mainland and continuous, but it is long: commonly cited at roughly 1,650 km from its northern to its southern extremity, with a commonly cited road distance of the order of 1,700 km between Hanoi and Ho Chi Minh City. The constraint is distance on a single congested axis, not water.
• Thailand is mainland with two coasts — the Gulf of Thailand on the east and the Andaman Sea on the west — but its deep-sea container gateways sit on the Gulf side, so an Andaman-coast or far-southern site is reached across the isthmus by road rather than across the nearer sea.
• Cambodia is mainland with one deep-sea port, and its second gateway is a river port reached from the sea along the Mekong through another country's territory, under a bilateral inland-waterway transport agreement between the two states.

Hold two pairs against each other and the axis becomes usable rather than descriptive. The Philippines and Vietnam are both long countries whose cargo has a long way to travel after discharge — but the Philippine leg needs a vessel, a berth, a domestic transport document and an answer to a cabotage question, while the Vietnamese leg needs a truck. Malaysia and Indonesia both cross water inside their own borders — but Malaysia's crossing is a customs event and Indonesia's is not, while Indonesia's is a change of flag by law and Malaysia's has been the subject of exemptions granted and withdrawn over time. One physical similarity, four different consequences.

Axis two: is there a cool season, and if so is it a design case or a shift-planning constraint?

The regional statement that there is no cold season is correct as a binder statement and needs one qualification as a construction statement. Two of these six markets have a genuine cool season and four do not — and the distinction is geographical rather than national, because it belongs to the northern parts of two countries rather than to the countries themselves.

• Northern Vietnam has a real winter by regional standards. The northeast monsoon pushes cool continental air into the Red River delta from around November to March, and the northern uplands — Sa Pa sits at roughly 1,500 m — record frost and occasional snow. The operationally important part is not the temperature but the moisture that comes with the late winter: a persistent fine drizzle through roughly February and March, known locally as mua phun and in older engineering literature as crachin, which keeps surfaces damp for weeks while registering very little rainfall. A bituminous mat cannot be laid on a damp surface, so a month that looks dry in a rainfall table can be unworkable on site.
• Northern Thailand has a cool season from around November to February, driven by the same northeast monsoon reaching down the Indochinese peninsula. The northern basins around Chiang Mai and Chiang Rai run cool at night, and Doi Inthanon, the country's highest point at 2,565 m, records frost.
• The other four have no cool season at all. Malaysia, most of Indonesia, the Philippines and lowland Cambodia sit within a few degrees of the same mean temperature every month of the year. Highland exceptions exist and are worth knowing so that you can recognise them rather than plan around them: the Cameron Highlands in Peninsular Malaysia and Baguio in Luzon both sit at roughly 1,500 m, and the Dieng plateau in Central Java at around 2,000 m records ground frost on dry-season nights. None of them is where the tonnage goes.

The rule that follows is narrow and worth stating exactly. A cool season in this region is a compaction-window and shift-planning constraint, not a low-temperature binder requirement. Cool damp air lengthens the time a mat takes to reach compaction temperature and shortens the working window on early and late shifts. It does not bring the pavement near the temperature at which low-temperature transverse cracking initiates. The only place to put the question to an engineer at all is an upland site in northern Vietnam or northern Thailand, and even there the honest expectation is that the answer will be no.

Axis three: is your cargo competing with a domestic alternative, or filling an absolute gap?

This is the axis most often skipped, and it decides what the offer has to prove rather than what it has to contain. Start with a distinction that a list of refineries will not give you: refining capacity and bitumen manufacturing capacity are not the same thing. A refinery produces paving binder only if it runs a crude whose residue is suitable and has a vacuum distillation train configured to make it. A modern refinery optimised for light products on light sweet crude may produce no bitumen at all. So the presence of a refining sector tells you very little on its own about whether your buyer has an alternative to your cargo.

• Cambodia has no refinery in commercial operation and imports the refined petroleum products it uses. Here an import is not a comparison, it is the only route, and the offer's job is delivery and evidence rather than displacement.
• The Philippines has seen its domestic refining sector contract over recent years, and imports a large share of the finished petroleum products it consumes. Treat the current position as a question for the buyer rather than a fixed fact: refinery operating status changes and this page names no facility.
• Indonesia refines domestically and, uniquely in this region, has a natural asphalt of its own: asbuton, the rock asphalt of Buton island in Southeast Sulawesi, which carries its own SNI and its own place in the works specification. An Indonesian enquiry can therefore be displaced not only by other imported binder but by a domestic material that is not petroleum bitumen at all.
• Thailand is the one market in this group with a substantial domestic refining sector and a working domestic bulk distribution system that delivers binder hot by road tanker to asphalt plants. A Thai enquiry is normally a comparison against material already on the domestic market rather than a gap to be filled, and the offer has to say in writing what it is better on — a test schedule, a certificate line, a grade or series that is not conveniently available, or a packed format the domestic bulk system does not serve.
• Vietnam and Malaysia both have refining sectors, and whether domestic paving binder is available to a specific project in the grade, volume and timing it needs is a project-level question rather than a national one. Ask the buyer directly. It is a normal question and the answer shapes the whole offer.

The commercial consequence is that the same offer is weak in one of these markets and strong in another for reasons that have nothing to do with the material. Where an import fills a gap, the questions are lead time, packing and evidence. Where an import competes, an offer that does not name the dimension on which it is better is not an offer at all, only a price.

Axis four: who wrote the acceptance document, and what does that do to the contract line?

The six fall into two families, and the family — not the grade — decides whether a contract line is enforceable.

• Markets with a national binder product standard of their own: Vietnam with TCVN 7493, Malaysia with MS 124 behind the JKR works specification, Indonesia with SNI 8135 behind the Bina Marga general specification, and Thailand, where the Thai Industrial Standards Institute issues the product standard for asphalt cement and the Department of Highways maintains the works specification a road contract incorporates. In these, the definition of the grade is held by a national document, and a contract citing only an international standard is either incomplete or is citing the wrong document.
• Markets that borrow an international standard by reference: the Philippines, where the DPWH Blue Book takes penetration-graded asphalt cement from AASHTO M 20 rather than from a national binder product standard, and Cambodia, where a donor-written project specification normally names AASHTO M 20 or ASTM D946 directly. In these, an international citation can be close to the whole promise — provided the edition is settled.

Two refinements inside the first family make this more than a taxonomy. Two of the four national standards have added a line the international basis does not carry: Vietnam controls adhesion to aggregate as a graded acceptance property with its own TCVN method standard, and Indonesia's SNI 8135 carries a softening point requirement, which AASHTO M 20 does not specify at all. And one of the four — Thailand — writes the designation in a notation an exporter can misread, since a Thai clause conventionally names the binder as AC 60-70 or AC 40-50, where AC stands for asphalt cement and is a material class rather than a specification. So inside a single family of four you have two documents that will test something an ordinary export certificate does not report, and one whose designation has to be read before it is answered.

This page prints no Thai designation number or edition, and that is deliberate. Thai procurement runs through the national highways department, the rural roads department, the Bangkok expressway authority, the capital's metropolitan administration and a very large number of provincial and local bodies whose documents are not uniform, and a standard number quoted from memory into a compliance box on an offer form is a false compliance claim sitting inside a contract. Ask for the clause the tender incorporates. It is a normal request and a serious buyer will send it.

The second refinement is where the revision risk sits, and it differs by family. A national standard is revised by its own body on its own cycle, and a live tender can perfectly well cite an edition that has been superseded. A borrowed standard changes when the works specification's edition changes, or when a donor updates a template — which means the binder requirement can move without the binder standard moving at all. Ask for the edition in both families, and ask for it in writing. It is the cheapest question on this page.

What does not vary, and why that is the useful part

Three things hold across all six, and they are what makes a single regional page possible. Conventional paving binder is classified by penetration at 25 °C everywhere here. The two numbers in a grade name are the band everywhere here, with none of the nominal-value arithmetic a buyer arriving from the Chinese market expects. And petroleum bitumen sits under HS heading 2713.20 in every one of these destinations, though national subheadings and duty treatment differ and must be confirmed with a licensed customs broker. Everything else on this page is an argument about which of six answers applies to you.

One: there is no cold season, so half the specification argument disappears

In a continental market the binder debate has two ends. The high-temperature end resists rutting in summer; the low-temperature end resists thermal cracking in winter; and a great deal of specification effort goes into the second. Northern China freezes. The South African Highveld gets frost. Northern India has a genuine winter. The Ethiopian and Kenyan highlands run cold at altitude.

Southeast Asia has none of that. The region spans roughly 11° south to 23° north, and there is no point in it where pavement temperature approaches the range in which low-temperature transverse cracking initiates. In a performance grade designation such as PG 70-10, the number after the hyphen is not the controlling parameter anywhere in this region. The honest exceptions are the northern Vietnamese uplands and the northern Thai highlands, which do run genuinely cool in the winter months — but that shows up as a shortened compaction window on early and late shifts, which is a construction constraint, not a thermal-cracking design case.

The practical effect is on what an offer should contain. A supplier who answers a Southeast Asian enquiry with cold-climate suitability, bending beam rheometer data or low-temperature grade selection is answering a question nobody in the region asked, and is signalling that the offer is a template. The binder argument here reduces to high-temperature stiffness — softening point, resistance to permanent deformation, and the stiffness retained after plant ageing — plus durability under water.

Two: it rains, and the pavement never dries out

Annual rainfall across much of the region runs between 1,500 and 4,000 mm, delivered either in concentrated monsoon months or, near the equator, on the majority of days of the year. Relative humidity stays high throughout. The pavement structure is wet as a normal service condition rather than as an occasional stress.

That makes stripping — the loss of adhesion between the binder film and the aggregate surface in the presence of water — the characteristic failure mode of the region. Once it starts, the mix loses cohesion, the surface ravels, more water enters faster, and the failure accelerates into potholing from the inside out. A binder that passes every consistency line and strips off wet stone is a failed binder in Southeast Asia and an entirely acceptable one in a dry market.

Two of the six markets have written this into the specification itself rather than leaving it to the mix designer. Vietnam controls adhesion to aggregate as a graded acceptance property with its own method standard, which ASTM D946 does not specify at all. Indonesia's SNI 8135 classifies by penetration in the same idiom as AASHTO M 20 but carries a softening point requirement that the AASHTO document does not specify at all — a national standard visibly adapted to a tropical service climate. Take the property table and its limits from the current edition of the standard itself rather than from any summary of it.

Why this combination puts softer grades on tropical roads

Here is the pattern that looks wrong from outside. Malaysia names 80/100 alongside 60/70 for asphaltic concrete. The Philippines works with 85-100. Indonesia names Pen 80/100 in its works specification. In Africa, India, the Gulf and China those grades are cool-climate or light-duty grades. Here they are mainstream paving grades in countries that never see winter.

Three things explain it, and none of them is preference:

• Peak pavement temperature is high but not extreme. This region is maritime and heavily clouded, and afternoon convective cloud and rain arrive on most days. That caps the surface temperature a pavement actually reaches, in a way that does not happen in a clear-sky desert market where the surface runs far above air temperature for hours at a stretch. Consistent heat and extreme heat are different design problems.
• Durability under water competes with rut resistance, and across this region it frequently wins. A binder one band softer carries a thicker film around each aggregate particle, and film thickness is what stands between the mix and moisture-induced ravelling. What makes that a regional observation rather than one country's habit is that two of the six acceptance documents have been written to police exactly this territory — Vietnam through an adhesion line, Indonesia through a softening point line — neither of which an ASTM penetration specification reports.
• Laying happens in interrupted windows. Rain stops paving repeatedly in all six markets, so mats go down between showers rather than through a settled dry shift, and regional practice weights workability accordingly. That is a construction-productivity argument rather than a binder-quality one, and it is one of the few arguments here that reads the same in every one of these countries.

Where the loading genuinely outruns that logic — expressway wearing courses, port access roads, industrial hardstanding — regional practice moves to modification rather than simply to a harder penetration grade, with the performance class taken from the project or concession specification. So the correct reading of a Southeast Asian enquiry naming 80/100 or 85-100 is almost never that the buyer meant 60/70.

Every market in this region classifies conventional paving binder by penetration at 25 °C, and every one of them writes the band the same way ASTM writes it: the two numbers are the band. This is worth stating because buyers arriving from the Chinese market expect otherwise — there a grade number such as 70# is a nominal value with a band either side of it, so 70# accepts anything from 60 to 80 dmm. Nothing in Southeast Asia works that way. A cargo certified as ASTM D946 60/70 lines up with a Vietnamese, Malaysian, Indonesian, Thai or Cambodian 60/70 band directly, with no arithmetic.

And that is exactly where the convenient similarity stops.

Two documents, not one, in every market

Each of these markets runs the same two-layer structure, and confusing the layers is the most common cause of a contract that cannot be enforced:

• A works specification that decides how the pavement is built and which binder each layer may take. JKR/SPJ in Malaysia, the DPWH Blue Book in the Philippines, the Bina Marga general specification in Indonesia, the Department of Highways standard specification for road works in Thailand, and a donor-written project specification in Cambodia.
• A binder acceptance document that decides what the grade must satisfy as a product. TCVN 7493 in Vietnam, MS 124 in Malaysia, SNI 8135 in Indonesia, the Thai Industrial Standard for asphalt cement in Thailand, and AASHTO M 20 by direct reference in the Philippines.

The works specification names the grade. The acceptance document defines it. A contract has to cite the second of those, and it has to cite the right second one for the destination. Watch what happens to a single identical contract line — bitumen 60/70, ASTM D946 — as you move it across the region: in Cambodia it can be the whole promise, because the tender itself frequently cites an international standard directly; in Vietnam it is an incomplete promise, because TCVN 7493 controls a property ASTM does not report; in Malaysia and Indonesia it cites the wrong document altogether, because a national standard holds the definition of the grade; and in Thailand it may not even be answering the question that was asked. One line, four different degrees of enforceability, decided entirely by which border the cargo crosses.

What that means for the certificate

The practical consequence lands entirely on the Certificate of Analysis. A standard export panel — penetration, softening point, ductility, flash point, solubility, relative density, loss on heating — is an ASTM-shaped certificate. Presented against a TCVN-shaped or SNI-shaped specification it can be entirely accurate and still say nothing at all about the property the resident engineer has been instructed to reject on. It is not a quality problem. It is an evidence problem, and it is cheap to fix before the cargo loads and expensive to fix afterwards.

So the useful question to put back to a Southeast Asian enquiry is never which grade. It is which acceptance document, which edition of it, and which pavement layer. That one answer settles the grade, settles the property lines the batch certificate has to report, and settles whether a modified binder is in scope at all.

Thailand writes the designation differently, and the difference is easy to read past

One market complicates the picture in a way worth flagging on a hub page, because a supplier working from a regional template will answer it carelessly. Thai road specification practice is written in the penetration idiom, but Thai documents conventionally write the band in the hyphenated style with an asphalt cement prefix: AC 60-70 is the designation a buyer meets most often, with AC 40-50 next. Three points of notation save arguments. The hyphen and the slash are the same thing — AASHTO M 20 writes 40-50, 60-70 and 85-100 with a hyphen while the export trade writes 40/50 and 60/70 with a slash, and they are the same bands measured by the same needle test at 25 °C, so a clause naming AC 60-70 is not naming something different from what an exporter calls 60/70. The prefix AC means asphalt cement and is not a specification: it tells you the material class, not which requirement table applies, and the requirement table is where the flash point limit, the solubility limit, the ductility requirement and the ageing criterion actually live. And a Thai clause may name a performance grade instead, which appears on heavier work and is a different document and a different test schedule altogether. Take the designation from the enquiry and the requirement table from the clause the tender incorporates. Everywhere else in the region, penetration is the only axis in play for conventional paving binder.

Where the journey actually ends

Work through the six and the pattern is unmistakable. In Indonesia and the Philippines the domestic leg is a sea leg by definition, because the destination is on another island. In Malaysia it is a sea leg whenever the site is in Sabah or Sarawak. In Cambodia the second gateway is a river port and the leg to it is a river voyage through another country's waters. Only in Vietnam and Thailand is the onward leg reliably a road movement — and in Vietnam that road movement can be most of the length of the country.

The commercial consequence is the one a long-corridor market has, arrived at from the opposite direction. A price quoted CFR or CIF to a gateway port prices the part of the journey that is easiest to price and leaves the rest open. For a Manila or Klang valley site that gap is small. For a site in Mindanao, in eastern Indonesia, in Sabah or up the Mekong, it is a second complete transport contract with its own carrier, its own transport document, its own handling and its own risk. An offer that does not say which of the two it is built on is not comparable with one that does, and the fix costs nothing: state the gateway the price is built to, state that the domestic leg is excluded, and say what kind of leg it is.

The domestic leg is usually somebody else's vessel, and that is a legal fact before it is a commercial one

Coastal trade between a country's own ports — cabotage — is regulated in every one of these markets, and the international carrier that brought the box in generally cannot carry it onward. This is worth understanding as a mechanism, because it explains why the domestic leg arrives as a separate quotation on a separate document rather than as a line on the freight offer.

• Indonesia reserves domestic sea carriage to Indonesian-flagged vessels under its national shipping law. The transfer of the cargo to a domestic carrier is not something a forwarder chose. It is the structure of the market, and it is why an Indonesian delivery to anywhere off Java has a handover built into it.
• The Philippines operates a cabotage regime with a statutory exception: legislation commonly known as the Foreign Ships Co-Loading Act permits foreign vessels to carry foreign cargo between Philippine ports in defined circumstances. Whether a specific movement qualifies is a question for the shipping line and a licensed broker, not an assumption on which to build a schedule.
• Malaysia administers a domestic shipping policy under its merchant shipping legislation, and exemptions covering particular trades and ports have been granted and withdrawn over time. Confirm the current position for the Peninsula-to-Borneo leg rather than relying on how a previous shipment moved.
• Vietnam and Thailand regulate coastal carriage too, but for most cargo into these two the onward leg is a road movement and the question does not arise in the same form.

Two practical points follow, and both cost money when they are missed. The domestic leg normally travels on a domestic bill of lading or waybill rather than under the ocean bill, which matters to any payment structure built on a negotiable document of title: a bank holding a marine bill of lading holds security over the first leg and not the second. And the marine cargo policy frequently ends at the first port of discharge, which leaves the second sea leg uninsured unless cover has been arranged deliberately to run through to the site. That is the most commonly missed line on a first island shipment in this region, and it is precisely the leg on which the drums are handled twice more.

The container, and why so much cargo here is stripped at the gateway

On a delivery near the gateway the box is emptied and returned quickly. On an island or upcountry delivery the box goes on with the cargo and has to come back through the same chain in reverse — domestic feeder, gateway yard, and only then the line. Shipping lines allow a contractually agreed period of free time and charge detention beyond it; those are commercial terms between the buyer and the line and no figures are stated here. Where the domestic leg is on another carrier's vessel, the round trip lengthens for a structural reason rather than an operational one, and nobody on the international side controls it.

That is why a large share of cargo in this region is stripped at the gateway and moved onward as drums on a domestic vessel, a barge or a flatbed rather than sent across water inside the box. The decision has to be made before the cargo is booked, because it changes three things at once: the packing, since drums stripped at a gateway are handled individually rather than by a container lift; the handling count, and therefore the condition and count risk; and the insurance arrangement, which now has to cover a leg that is not a containerised sea movement. Ask the question at enquiry stage rather than discovering it on an invoice.

What an island quay actually has, and what that does to the drum decision

The far end of a domestic leg in this region is frequently not a container terminal. It is a general cargo berth, a roll-on roll-off ramp on a nautical-highway route, a barge or landing craft working onto a small jetty, or a provincial quay whose handling equipment is a forklift and a gang. Three consequences follow, and together they are the reason drums dominate this region for the same underlying reason they dominate a long African corridor, reached from the opposite direction:

• Unit weight has to match the handling at the far end, not at the near end. Where drums are moved without a forklift, the 150 kg drum — 80 drums and 12 MT per 20 ft container — is the format that can actually be landed. The 185 kg drum at 14.8 MT per container buys the best tonnage per box and quietly assumes handling equipment exists at the far end. Choosing between them is a site question, not a price question.
• A drum fails locally. A damaged drum costs one drum out of eighty. A compromised bulk parcel costs the consignment, at the far end of a second sea leg, with no realistic reverse gear.
• Bulk needs contracted shore facilities that cannot be inferred. Heated tankage of adequate capacity, a compatible discharge connection, a pump and the ability to take a whole parcel promptly are contracted commercial arrangements with individual terminal operators. They can never be assumed from a port's name, its size, or the presence of petroleum handling at it. Nothing on this page states that any facility named anywhere on it handles bitumen or is available for your cargo.

The mainland legs, which are a different problem with much the same answer

Where the onward leg is a road or river movement rather than a sea one, three specifics are worth holding before the forwarder conversation.

• Vietnam is a length problem. With a commonly cited road distance of the order of 1,700 km between Hanoi and Ho Chi Minh City, and a national spine carrying channelised heavy truck traffic along much of it, the sensible plan is to land at the port cluster nearest the site — north, centre or south — rather than at the largest port and drive. The Central Highlands are served from the central coast rather than from either end of the country.
• Cambodia is a route choice, and the route has a season. The deep-sea port and the river port are different journeys with different vessel constraints, and the river route's permissible draught falls with the river through the dry months — which is the inverse of the rainfall constraint on the roads. Take the permissible draught and the vessel size for your shipment date from the shipping line or a local agent rather than from any published figure.
• Thailand is an isthmus problem at its southern end. The deep-sea gateways sit on the Gulf side, so an Andaman-coast site crosses by road; and the Bangkok river port carries vessel size limits that the deep-sea gateway does not, which is a parcel-size question before it is a cost one.

Land crossings, and the three ASEAN instruments a buyer will meet

Overland movement between these countries is a genuine option on the mainland — Thailand to Cambodia, Thailand to Malaysia, Vietnam to Cambodia — and a buyer investigating it will run into three regional instruments. All three are worth knowing by name, and one of them is worth knowing precisely because it does not help.

• The ASEAN Framework Agreement on the Facilitation of Goods in Transit is the regional legal basis for moving goods across a member state's territory without entering it for home use, and the ASEAN Customs Transit System is the electronic procedure built on it, under which a single transit declaration and a single guarantee can cover a road movement across participating member states. Participation, scope, and whether a particular commodity and carrier can use it, are questions for a licensed customs broker rather than assumptions.
• The Greater Mekong Subregion Cross-Border Transport Agreement is the separate arrangement covering road transport across the Mekong countries, and it is the framework a Cambodian, Vietnamese or Thai overland enquiry will meet first.
• The ASEAN Trade in Goods Agreement gives preferential tariff treatment to goods originating in an ASEAN member state, evidenced by a Form D certificate of origin now exchanged electronically through the ASEAN Single Window. This is the instrument that does not help an import from outside the region. Form D requires ASEAN origin. A cargo of Middle East origin cannot obtain one, and no amount of transhipment through an ASEAN hub creates origin — transhipment is a movement, not a manufacture. Duty treatment for such a cargo is the destination's ordinary applied rate under its own tariff, and no rates of any kind are stated on this page.

The delivery term has to match the leg, and it has to name a place

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 a gateway. They have no coherent meaning for a truck arriving at a plant in the Central Highlands or a barge landing drums on a provincial jetty. The rules that work for any mode are FCA, CPT, CIP, DAP, DPU and DDP, and every one of them names a place. The choice of rule is settled by the mode of the last leg, not by habit.

Three errors recur on this region's business:

• Letting a gateway price be read as a delivered price. For an island or upcountry site it prices the first leg only. Label it, and name the gateway it is built to.
• Naming a country instead of a place. DAP Indonesia is not a delivery term; DAP followed by a named port, plant or project site is. On a two-leg movement the named place also has to settle who arranges the domestic carriage and who bears the cost of cargo standing at a transhipment yard, because standing cargo in this climate is not neutral.
• Agreeing DDP casually into a market with a conformity mechanism. DDP puts import clearance and charges on a seller who may not be able to act as importer of record, in a market where a certification or import-approval requirement may attach to the import. It should never be agreed before the conformity question in the table above has been answered in writing.

The decision rule for this whole section is one line. Price to the site, not to the gateway; and choose the packing against the last leg, not the first.

Look at where a container actually goes on a Gulf-to-Southeast-Asia routing. Direct calls exist at the largest gateways. For a secondary port — Quy Nhon, Bintulu, Makassar, Davao, Sihanoukville, General Santos — the box is almost always transhipped, and the hubs it transships through sit between roughly 1° and 3° north: Singapore, Port Klang, Tanjung Pelepas. The cargo does not merely cross the tropics. It stops and sits in them.

The temperature chain nobody prices

Add the legs together and the picture is a cargo that never gets cold from the day it is stuffed:

• A load-port yard in a Gulf summer.
• A sea leg through consistently warm water.
• Days of yard soak at an equatorial hub, where the overnight low barely drops and humidity stays high, so a steel box does not shed the heat it took on during the day.
• A second short sea leg, a destination yard, and then an inland or inter-island leg.

A steel container standing in direct sun runs an internal air temperature well above ambient, and the roof plate runs higher still. Nothing in that cycle comes near bitumen's working temperature — this is not a product-degradation argument. It is more than enough, though, to keep the surface of a softer binder soft for weeks at a stretch, under whatever load is stacked on top of it.

What that does, by packing type

• New steel drums tolerate it. The exposure is deformation and seam or seal damage where drums are badly stowed or over-stacked, not loss of product. This is the packing that makes a transhipped tropical routing uneventful.
• Jumbo, poly and sealo bags are the real exposure. Bag packing works because a thin film holds a softened block. Sustained heat plus stack pressure makes adjacent bags fuse into a single mass, and the meltable-packaging advantage becomes a discharge problem at the far end.
• Grade decides how much of this matters. 60/70 handles the voyage comfortably. 80/100, 85-100 and anything softer is where the trouble concentrates — and those are precisely the grades several markets in this region specify as mainstream.

The humidity problem that is specific to this region

Dry-route heat soak is one thing. Equatorial heat soak is another, because the air entering the box at a hub yard is both hot and saturated. When the container cools at night, that moisture condenses on the inside of the roof and runs or drips onto the cargo. On a long transhipped routing this cycle repeats for weeks.

For sealed new steel drums the consequence is usually cosmetic — external rust staining and surface corrosion, unattractive on arrival and occasionally the trigger for a condition dispute that has nothing to do with the binder inside. Where it stops being cosmetic is a compromised seal: water that reaches the product shows up as free water on an ASTM D95 test, foams on heating and can mask a weight discrepancy. Reconditioned drums fail this test far more often than new ones, which is one more reason to specify drums explicitly as new on this lane.

Three things to settle while the packing decision is still open

• Ask for the routing and the transhipment port before fixing. You cannot control where a box is stowed on a vessel or how long it waits at a hub, but you can decide what is inside it once you know.
• For 80/100 and softer on a transhipped routing, specify new steel drums over bag packing, and treat the packing premium as insurance rather than as a cost to negotiate away.
• Remember the domestic leg is often a second sea leg. In the Philippines, Indonesia and East Malaysia the cargo is transhipped again inside the destination country, which extends the heat exposure past the point most buyers stop counting. Containerised shipment planning has to run to the site, not to the first port of entry.

• Bitumen supply to China — the nominal-value grading system this page contrasts itself against, where 70# is a midpoint covering 60–80 dmm rather than a band, and where the containment between the two systems runs one way only
• Middle East bitumen supply — the origin end of this lane, and why a cargo originating there cannot obtain an ASEAN Form D no matter which regional hub it transships through