A bitumen drum is not a generic barrel. Its gauge, its closure and its markings all have commercial consequences at the far end of the voyage.
The vessel used for drummed bitumen export is a cylindrical steel drum of nominal 200 to 210 litres capacity — the same basic container used across the petroleum and chemical trades, dimensioned in the ISO 15750 series of standards. Packaging nomenclature separates the 1A1 steel drum, which has a non-removable head closed by bungs, from the 1A2 steel drum, which has a removable head. Bitumen never uses the bung-only form, for an obvious reason: a binder that is solid at ambient temperature cannot be poured out through a two-inch bung. It has to be filled and emptied through the full diameter of the drum. So what arrives is an open-top drum, filled through the open end and then closed in one of two ways — by a head seamed permanently onto the body, which has to be cut off at destination, or by a genuinely removable head clamped with a lever-locking ring. The two look almost identical in a photograph and they are emptied completely differently. Note also that bitumen at ambient temperature is not a dangerous good, so these drums are not normally UN performance-certified; the codes are useful here as a description of how the drum is built, not as evidence of an approval.
The body and the two heads are cold-rolled steel. Two rolling hoops are pressed into the body wall so the drum can be rolled on its side without the wall collapsing, and the heads are joined to the body by a double seam that forms the top and bottom chimes. Those chimes take almost all of the abuse in handling — they are what a forklift tine, a drum clamp and a slung sling all bear against — and a crushed chime is the most common visible damage on a container of drums.
Drum makers quote three thicknesses: body, top head and bottom head. For bitumen service these normally fall in the range of 0.8 to 1.2 mm for the body and 1.0 to 1.5 mm for the heads. Gauge is what decides whether a drum survives being double stacked, road-hauled inland and rolled across a yard by hand, or whether it splits at the seam and bleeds binder across the container floor.
Tare weight is a useful proxy for gauge, because the empty weight follows directly from how much steel is in the drum. A finished empty drum in the 18 to 22 kg range is built from a sensible gauge for bitumen. A drum materially lighter than that is a thin shell, and while it will hold product on a flat quay it is the one that fails after two transhipments and a rough inland leg. Ask for the gauge and the tare in the offer, not after the seam has opened.
Two closure families are in service, and they lead to completely different work at destination.
Neither is better in the abstract. What matters is that the buyer knows which one is coming, because a yard that has no drum opener and no plan for eighty seamed lids will lose a day it did not budget for.
The interior of a bitumen drum is bare steel. No lining is required — bitumen does not attack steel — and an internal lacquer is simply one more material that can end up in the binder and show against a solubility test. The exterior is primed and painted, mostly to survive the yard and the sea leg rather than for appearance.
Each drum should carry the product grade, the net weight, the tare, the batch or lot number, the production date and the country of origin. Origin marking on the package itself is a customs requirement in a number of destination markets, and it is far cheaper to have it stencilled at the filling line than to have a container held while it is applied at the port of discharge.
The same 200 to 210 litre drum is offered at three net weights. The steel, the tare and the container slot are identical in all three cases — only the amount of product changes, which is why fill weight moves landed cost per tonne more than almost any other packing decision.
| Net weight of product | Typical tare | Gross per drum | Product volume at 15 °C | Product volume at 150 °C | Freeboard left in a 210 L drum when hot |
|---|---|---|---|---|---|
| 150 kg | 18–22 kg | 168–172 kg | 146 L | 158 L | about 52 L |
| 180 kg | 18–22 kg | 198–202 kg | 175 L | 189 L | about 21 L |
| 185 kg | 18–22 kg | 203–207 kg | 180 L | 194 L | about 16 L |
This is the distinction that decides whether a drummed cargo arrives clean or arrives as a claim. Everything else on this page is logistics; this part is specification.
A reconditioned drum is a used drum that has been collected after its previous service, emptied, cleaned by some combination of washing, caustic treatment, shot blasting or burning out in a furnace, re-formed where it was dented, leak tested and repainted. The trade is legitimate, well established and regulated — under the UN Model Regulations a reconditioner marks the drum with its own identification and the letter R. Reconditioned drums are entirely appropriate for many products. Bitumen bought against a laboratory specification is not one of them.
Below true reconditioning there is a second tier that causes even more trouble: drums that have merely been rinsed, drained and repainted. They look new from three metres away. They are not.
Hot bitumen entering a drum at 140 to 160 °C is an aggressive solvent poured onto whatever is still on the wall. Residue does not sit in a corner and wait — it dissolves, disperses and becomes part of the batch. Four specification lines catch it, and each of them is a rejection:
Contamination is usually imagined as some exotic chemical. In practice the most frequent offender is plain water left in a drum that was washed and stacked before it dried. It is also the most dangerous, because steam generated under a crust of setting bitumen can eject hot product from the drum mouth. A new drum arriving dry and sealed from the drum plant sidesteps the whole problem.
Shot blasting and repeated handling take metal off the wall. A reconditioned drum starts its second life with less steel than it had in its first, and the seams have already been worked once. On a long sea leg with a hot-country inland run behind it, that shows up as leakers — binder on the container floor, a cleaning charge from the line, stained drums that the consignee will not accept, and a quantity shortfall that nobody can attribute cleanly.
Vague packing wording is what allows the substitution to happen. Put it beyond argument:
Timing is the whole difficulty. A drum stops being inspectable the moment it is filled: the evidence that mattered is now underneath 185 kg of binder, and everything visible from the outside is paint. The only window is the empties standing on the filling line, which in practice means the inspector has to be appointed, instructed and physically present before production starts, rather than called to a warehouse afterwards. That requirement belongs in the purchase order, not in a message sent during the week of loading.
Then ask for two things in writing. First, a certificate that records the condition of the packing as a finding in its own words, not a quality certificate that mentions packing in passing. Second, dated photographs of the empty drums with the batch identifiable in the frame. Neither costs anything meaningful, and what both do is move the burden of proof: if the drums were photographed empty, bright and unmarked before filling, a later contamination claim has to explain itself somewhere else; if they were never photographed at all, the seller has no answer to give. Agree in advance what happens when the check fails — drums rejected and replaced at the seller's cost, before stuffing — because a finding with no consequence attached to it simply gets noted and shipped.
The saving from reconditioned drums is small measured against the value of the bitumen they carry, and vanishingly small against the cost of a rejected container sitting at a discharge port. That asymmetry is the whole argument.
The differences are not cosmetic. Each one has a place where it eventually shows up on a document.
| Point of comparison | New steel drum | Reconditioned drum | Where it surfaces commercially |
|---|---|---|---|
| Previous contents | None — first use | Unknown unless the reconditioner's records are produced | Solubility and ash results on the Certificate of Analysis |
| Internal condition at filling | Bare, dry, clean from the drum plant | Washed or blasted; may retain moisture, scale or grit | Water content, ASTM D95; foaming on the filling line |
| Wall thickness | As manufactured, 0.8–1.2 mm body | Reduced by blasting and prior service | Leakers in transit and container cleaning charges |
| Seam integrity | Seamed once, factory leak tested | Seams already worked; repairs possible | Binder on the container floor; rejected drums at discharge |
| Tare consistency | Uniform across the batch | Varies drum to drum with repairs and paint | Disputes over net weight when the invoice is checked by weighing |
| Appearance on arrival | Uniform, unmarked, clearly new | Ghosted stencils, mixed colours, repaint over damage | Consignee refusal and end-user confidence in the product |
| Markings on the drum | The drum maker's own marking and nothing else | Carries the reconditioner's identification and the letter R alongside the original maker's marking | The easiest single item for an inspector to check, and it takes seconds |
| Cost position | Higher packing cost per drum | Cheaper per drum | A small saving per tonne set against the full cargo value if it is rejected |
Six stages separate a hot batch of binder from a container that can be sealed. Each one has a failure mode that a buyer can specify against.
Drums arrive from the drum plant and are staged under cover. They are confirmed as new and unused, checked for dents at the chime, and confirmed dry inside. Drums that have stood open in the rain are not fit to fill — moisture in the seam is what causes foaming a few minutes later.
Bitumen is filled at roughly 140 to 160 °C, the range in which it is fluid enough to pour cleanly and dispense accurately. Filling is done over a scale so the net weight is set by mass, not by eye or by level, and a headspace is deliberately left because hot product occupies around 8 % more volume than the same mass cold.
Filled drums are stood upright and allowed to cool, normally overnight. Three things depend on this. A drum whose wall is still hot is soft and will deform under the weight of a second layer. A sealed drum closed while the contents are still hot traps vapour. And the binder shrinks as it cools, forming the slightly concave surface seen when a drum is opened — that dish is normal and is not evidence of underfilling.
Once cool, the head is seamed or the locking ring is closed onto its gasket, and the drum is stencilled with grade, net, tare, batch and origin. Batch identity should tie back to the Certificate of Analysis covering that production, so a drum picked at random at destination can be traced to a specific test report.
Drums travel either loose on the container floor or four to a pallet, strapped and wrapped. Floor loading fits the drums tightly and avoids pallet cost; palletised drums are far faster to discharge and much easier to move with a plain forklift at a yard that has no drum clamp. Decide this before the container is stuffed, because it cannot be changed afterwards.
A standard 20-foot container takes drums four across and ten deep, double stacked — forty per layer, eighty in total. The floor is swept clean and dry first. Void spaces at the door end are filled with dunnage or inflatable bags, the top layer is restrained so it cannot topple when the container is tilted on a chassis, and the face is strapped. The IMO/ILO/UNECE CTU Code is the recognised reference for how cargo in a container should be secured, and it is the document a surveyor will cite if a container arrives with its stow collapsed.
These are the loading figures used across this site. Note how little the packing tare changes between drum sizes and how much the net cargo changes — the container slot and the freight cost are the same in every drummed row.
| Packing | Net per unit | Units per 20' FCL | Net cargo per FCL | Packing tare in the container | Indicative cargo gross |
|---|---|---|---|---|---|
| New steel drum | 150 kg | 80 drums | 12.0 MT | about 1.6 MT of steel | about 13.6 MT |
| New steel drum | 180 kg | 80 drums | 14.4 MT | about 1.6 MT of steel | about 16.0 MT |
| New steel drum | 185 kg | 80 drums | 14.8 MT | about 1.6 MT of steel | about 16.4 MT |
| Jumbo bag / bitubag | 1 MT | 20 bags | 20.0 MT | bag fabric only | about 20.1 MT |
| Poly / sealo bag | 1 MT | 20 bags | 20.0 MT | meltable film only | about 20.1 MT |
| Bitutainer / tank container | 20–25 MT | 1 unit | 20–25 MT | tank tare, not cargo | per equipment plate |
A drummed cargo has three weights and they are used for three different purposes. Confusing them is how a buyer ends up paying freight rates on steel and duty on packaging.
The three figures are simple to define and must be recorded separately on every document:
Eighty drums of 185 kg net carry 14.8 MT of bitumen and roughly 1.6 MT of steel. If the invoice is written on gross weight, the buyer pays the bitumen price for 1.6 tonnes of steel and receives no binder for it — an overcharge of nearly 11 % measured against the product actually delivered, or, looked at from the other side, roughly one tonne in every ten on the invoice is drum. The same error at 150 kg net is worse in proportion: 1.6 tonnes of steel against 12 MT of product is over 13 %.
The contract wording that closes this is short: quantity is net weight of bitumen in metric tonnes, exclusive of drum tare and all packing materials. Pair it with a stated net weight per drum and a tolerance, and with the basis of determination — normally the drum count multiplied by the declared net, verified by weighing a sample of filled drums against a weighed sample of empties from the same batch. That is also why tare consistency matters: if the empties vary, the verification cannot be performed.
A 20-foot container of 185 kg drums, palletised, works out roughly as follows:
Every one of those numbers is correct for its own purpose. The one that belongs on the commercial invoice is the first.
Excluding tare from the invoice does not mean the gross figure can be ignored. Ocean and inland freight are charged on gross. Several customs tariffs assess duty or fees on gross weight rather than net, so the drums can attract duty even though they were not bought as product. Road weight limits on the inland leg apply to gross. And the shipper is obliged under SOLAS to declare a verified gross mass for the packed container before it can be loaded. Know both numbers; put only one of them on the invoice.
The packing list is where net, tare and gross are proved. It should show the drum count, the net per drum, the total net, the total tare and the total gross, with the batch reference. Those figures then have to match the commercial invoice, the bill of lading, the inspection certificate and the letter of credit. A packing list that shows only a gross figure, or that quotes one lump weight with no breakdown, is not a document a bank or a customs broker can work from — and by the time anyone notices, the container is normally already at sea.
Drummed bitumen has to be melted back into a liquid before it can be used. Plan the equipment, the labour and the empty drums before the container arrives, not on the day it does.
A seamed drum is opened with a manual or hydraulic de-header that cuts below the top chime, leaving a clean edge and an intact body. A lever-ring drum simply unbolts. Never use a cutting torch or an angle grinder on a drum that has held bitumen: hot work on any drum that has contained a hydrocarbon is a recognised cause of serious injury, because residue and vapour stay in the seam long after the drum looks empty.
The standard answer at any serious yard. Drums are loaded into an insulated chamber heated by circulating hot oil or by electric elements, open end downward, and the binder melts and drains into a heated holding tank below. Throughput is rated in tonnes per hour, and the melt is gradual and uniform, which is exactly what the binder needs.
Some asphalt plants are fitted with a drum melting attachment that feeds the binder tank directly. Where the plant has no such attachment and no melter, drummed supply is the wrong packing choice — jumbo bags or a bitutainer will serve better. Check this before ordering, not after.
Firing a burner against a dry drum wall carbonises the binder in contact with the steel, drops penetration in the material that survives, and creates a serious fire risk. Bitumen must be heated gradually and uniformly, and no heating element or coil should ever be exposed above the product level.
A film of binder always remains on the wall; drums drained while still hot leave less than drums allowed to cool. Empties should be drained fully, stored inverted and under cover, and sent to a licensed reconditioner or scrap recycler. Never repurpose them for water, fuel or food. Those empties are exactly where the reconditioned drum trade gets its stock.
Cool with clean cold running water for at least 20 minutes. Never peel or solvent-strip adhered bitumen — removal is a clinical decision. Get medical attention. The adhered binder acts as a sterile dressing in the meantime, and pulling it away takes skin with it.
It means a first-use drum supplied direct from a drum manufacturer, never previously filled with any product. It is not a quality adjective and it is not implied by silence — if the contract only says "steel drums", a reconditioned drum satisfies it. Write "new, unused, first-use steel drums; reconditioned or previously used drums not acceptable" and have the inspection certificate confirm packing condition.
Eighty. That number comes from the floor plan and the internal height of the box rather than from its weight limit — four drums across the width, ten along the length, and two tiers and no more, because the binder softens in transit and a third tier deforms the drums underneath it. What the fill weight changes is only the tonnage sitting inside those eighty drums: 12 MT at 150 kg net, 14.4 MT at 180 kg and 14.8 MT at 185 kg. A 20-foot box could legally carry roughly twice that mass, which is precisely why drummed cargo costs more in freight per tonne than any other packing. Confirm against the loading plan for the actual drum dimensions and against any weight limit on the inland leg.
Roughly 18 to 22 kg for a new steel drum, depending on the steel gauge. Tare is packing and must be excluded from the invoiced net weight. It should appear as its own column on the packing list alongside net and gross, and the tare should be consistent across the batch so that a sample weighing can actually verify the net.
Because the contamination is invisible until it appears on a test report, and by then the cargo is at the discharge port. Whatever the previous cargo left behind, and whatever the cleaning process failed to remove, goes into solution in hot binder and reports against the specification — most commonly as a solubility or an ash result outside the limit. What makes that commercially painful is the argument that follows it. The load-port Certificate of Analysis shows a compliant batch, the destination laboratory shows a non-compliant cargo, and once the product is out of the drums nobody can demonstrate which drum caused it. The seller questions the laboratory, the buyer holds the seller, and the packing decision that started it was worth a few dollars a tonne. That asymmetry, rather than the chemistry, is the reason to specify new drums.
Typically 140 to 160 °C, the range in which the binder is fluid enough to pour cleanly and be dispensed accurately by weight. Drums are filled hot and then left to cool, normally overnight, before they are closed, stacked or moved — a hot drum wall is soft and will deform under a second layer, and closing a drum on hot product traps vapour.
Bitumen packed in drums and shipped at ambient temperature is generally not regulated as dangerous goods, because it is a solid at ambient with a flash point well above the classification threshold. Bitumen carried at or above 100 °C falls under UN 3257, elevated temperature liquid, Class 9 — which applies to hot bulk movements, not to cooled drums. Confirm the position with your carrier and supply the Safety Data Sheet with the booking.
The drum is de-headed with a mechanical drum opener, then melted in a drum melting unit — an insulated chamber heated by hot oil or electric elements in which the binder melts and drains into a heated tank. Some asphalt plants have a melting attachment that charges the binder tank directly. Heating a drum with an open flame is not an acceptable method: it carbonises the binder against the steel and is a fire risk.
The steel, the tare and the container slot are identical, so the 185 kg drum carries 14.8 MT against 12 MT for the same freight — a materially lower landed cost per tonne. The case for the 150 kg drum is handling: it is lighter to move by hand where there is no forklift or drum clamp, and easier for small end users to manage. Decide on the equipment available at the delivery point.
Send the grade, the tonnage, the drum net weight you want, the destination port and the Incoterm. State whether you need palletised or floor-loaded drums and whether pre-shipment inspection is to confirm packing condition, and the offer will be built on that basis.