API Export Packing: ISPM-15, Pallets and Container Loading

Between a passing COA and a releasable batch sits a layer nobody tests on paper: the physical one. Drums, pallets, wrapping, container choice and the way all of it stands for thirty days at sea. Most transit complaints trace back to this layer, and almost all of it was decided before the container doors closed.

The good news is that the layer is governable by checklist. Four items decide most outcomes.

Wood that will not stop a shipment

Wooden pallets and crates cross borders under ISPM 15, the international standard for treating wood packaging material, administered under the International Plant Protection Convention. Non-compliant wood is one of the few packing faults that customs can act on by itself: a container can be held, re-exported or destroyed over a pallet stamp.

The buyer's check is small: ask that wood packaging carry the ISPM 15 mark and put the requirement in writing. Where the trade lane is strict, many shippers simply move to plastic pallets, which sidestep the standard entirely. Either answer is fine; discovering the question at the port is not.

Drums and liners as a system

The fibre drum, the inner liner and the closure are a system with one job: keeping the inside world stable while the outside world shakes, sweats and heats. For moisture-sensitive powders the liner specification matters more than the drum, for reasons developed in packaging and storage for sensitive powders; a breathable liner in a humid lane undoes a perfect COA within weeks.

Container sweat is the mechanism buyers underestimate. A sealed container cycles through day-night temperature swings, and condensation forms on inner surfaces and drips. Desiccants, liner quality and void fill all manage it; empty air space feeds it.

Loading: the physics of stacking

Three rules cover most of it. Weight down, light up: heavy drums belong at the bottom of the stack. No overhang: a pallet that extends past its footprint loses its edge strength the first time the container accelerates. And a loading plan that lets air move: drums strapped into a tight block survive better than drums floating in a half-empty box, because movement is what converts a stable stack into a leaning one.

For material with a storage temperature condition, the container itself becomes part of the quality decision, which is the subject of the transit analysis in temperature excursions and mean kinetic temperature. Most bile-derived powders travel ambient, but the packing plan should say so explicitly rather than assume it.

Who owns what

The Incoterm decides where risk transfers but says nothing about how well anything is packed, a gap analysed in the Incoterms piece. The practical resolution is a packing specification in the purchase documents: pallet type and mark, liner specification, desiccant, stacking height and labelling. It costs a paragraph and converts packing from a supplier habit into an agreed requirement, which is the difference between arguing and claiming when a shipment arrives wrong.

One last habit: photograph the loaded container before the doors close. Thirty seconds of evidence answers more transit disputes than any document, because the physical layer, unlike the paper layer, leaves no records of its own.

A packing specification that fits in a purchase order looks like this: pallet type, plastic or ISPM 15-marked wood; liner material and thickness per drum; desiccant quantity and placement; stacking height limit; pallet overhang tolerance; and labelling requirements for handling marks. Six lines, agreed once, reused every order, and the basis of any claim if a shipment arrives wrong.

Labelling is the half of packing that travels furthest. Handling marks, orientation arrows, batch references and consignee details on the drum and the pallet answer questions at every handover point, and the discipline is the same one that governs the paperwork layer: every label must agree with every document, a consistency rule developed in shipment document consistency.

The container choice is a decision, not a default. For ambient-tolerance powder, a standard dry box with sweat management is the norm. Where a storage temperature condition exists, or where the lane's thermal profile is brutal, the refrigerated box enters the conversation, at a cost that must be weighed against the product's real thermal sensitivity rather than assumed; the sensitivity question is treated quantitatively in the transit temperature piece.

When damage happens despite the specification, the claim runs on evidence: the packing specification you agreed, the loading photographs, the container condition at receipt, and the drum condition before opening. Standards bodies maintain the reference frame for much of this; packaging and freight standards are indexed by ISO, wood packaging rules by the IPPC, and customs-side handling expectations by the WCO.

Weight distribution closes the list. Containers have a practical centre-of-gravity window, and a box loaded all-heavy at one end can be refused at the terminal or, worse, accepted and then handled roughly. Spreading drum weight across the floor, or across two pallet rows, is a five-minute planning step that prevents both outcomes. For tall stacks, strapping and edge boards keep the middle of the block from becoming the weak point; the forces at work are ordinary physics, and the ones that damage powder are vibration and shear rather than gravity alone.

None of this is chemistry, and none of it appears on a COA. It is the layer that decides whether the COA still describes the drum at arrival, and it costs one paragraph in the purchase documents to control.

Frequently asked questions

What is ISPM 15 and why does it matter for API shipments?

It is the international standard for treating wood packaging material, administered under the IPPC. Non-compliant pallets or crates can cause customs holds, re-export or destruction of a container, which is why the mark belongs in the packing specification.

How can container sweat be managed?

With liner quality, desiccants and minimal air voids. Sealed containers cycle through day-night temperature swings and condensation forms inside; a breathable liner or generous empty space feeds the cycle instead of resisting it.

What are the basic stacking rules for drums?

Heavy drums at the bottom, no pallet overhang, and a tight loaded block rather than floating drums in a half-empty box. Movement, not weight alone, is what turns a stable stack into a leaning one.

Does the Incoterm cover packing quality?

No. It allocates cost and risk transfer but says nothing about how the goods are packed. A written packing specification in the purchase documents is what turns packing from habit into an agreed, claimable requirement.

Are plastic pallets acceptable instead of treated wood?

Yes, and they sidestep ISPM 15 entirely, which is why many shippers on strict lanes prefer them. The requirement is compliance with the wood rule or absence of wood, stated in advance either way.

What single habit prevents most transit disputes?

Photographing the loaded container before the doors close. The physical layer leaves no records of its own, and thirty seconds of images answers questions no document can.