Paper Honeycomb Pallet FAQ: Load Ratings, Racks and ISPM 15

Paper pallets are chosen for what they avoid: fumigation, weight and splinters. They are rejected for what they do not avoid: load, moisture and handling. These questions cover the ratings to ask for, the test that predicts a rack failure, and the phytosanitary position for a pallet that may contain a wooden block.

What load ratings should a paper pallet have?

Static, dynamic and rack, stated separately. A static rating describes a pallet at rest with the load distributed, a dynamic rating describes handling and transport, and a rack rating describes the pallet supported only at two edges with the load spanning between them. A paper honeycomb pallet is strong in compression and weaker in bending, so the rack rating is usually the lowest of the three and the most relevant to a warehouse. A supplier who quotes one number is quoting the easiest one. Ask for each rating with the test method, the support span and the conditioning humidity, and compare them with the actual warehouse rack rather than with the pallet brochure.

Why does a pallet fail at the corner?

Because the corner is where a forklift hits it and where the deck edge has the least support. A fork that enters at an angle, or that strikes the stringer instead of the entry, splits the deck and starts a delamination that grows under load. The failure is usually handling rather than material, and it is prevented by marking the entry height, training the loading crew and using corner protectors where a pallet truck has no side support. If a corner failure appears in a shipment, check the loading photographs before blaming the pallet: a crushed corner with a clean break at the deck edge looks like impact, while a crushed corner with a soft, separated edge looks like moisture.

Does ISPM 15 apply to a paper pallet?

No, when the pallet is a processed paper product, because ISPM 15 applies to solid wood packaging. That exemption is one reason exporters consider paper pallets, and it is not a blanket freedom: the destination may still require the pallet to be clean and free of soil, and any solid wood component such as a block, a stringer or a repair piece brings the pallet back inside the scope and requires the mark. Mixed pallets are the case that causes delays, because the paper part is exempt and the wood part is not. Confirm the composition with the supplier in writing and check the drawing before the shipment is booked.

How does moisture change the rating?

A paper pallet takes up water through the deck edges and the open cell ends, and the fiber softens. A pallet rated in a dry room can lose a large share of its capacity on a wet dock or in a humid container. A coating on the faces slows the uptake and sealing the edges slows it further, because the vented cells are the fastest path. For a route with a wet dock or a long sea voyage, wrap the pallet stack, add a desiccant and treat the wrap as part of the pack rather than as an option. If the pallet is intended for a return trip, inspect it at the destination, because a pallet that has been wet and re-dried has lost capacity.

How is a rack test run?

Support the pallet on two edges at the span of the destination rack, load it to the rated weight, and hold it for the storage duration at the storage humidity. Measure the deflection at the centre of the deck at the start, the middle and the end, and inspect the stringers for buckling and the deck for delamination. A short test in a dry room passes almost any pallet; the value comes from the duration and the humidity, because paper creeps. Photograph the result and label the failure mode, so the next design change targets the right property. Repeat after any change of paper grade, adhesive or deck construction.

What should the purchase order state?

The static, dynamic and rack ratings with the humidity condition, the fork entry height, the coating or wrap, the corner protection, the pallet marking and the material composition for the phytosanitary declaration. Add a first-article test report with conditioning details and a retained sample. Add a notification clause for any change of paper grade, adhesive or deck construction, because those changes move the rating without changing the drawing. A pallet is a structural product and the specification should read like one, with values, methods and a revision.

When is wood still the better choice?

For a heavy concentrated load, a very wet route, or a closed loop where the pallet is used many times. A paper pallet is at its best as a light, dry, single-trip deck in a framed crate or for air freight where weight matters. Asking a paper pallet to do a wood pallet's job is the fastest way to a claim that neither side can win, and the conversation is cheaper before the order than after the container.

How should a damaged pallet be handled at destination?

Photograph it in place, note the pallet serial or mark, and keep the damaged section rather than discarding it. A teardown shows whether the failure is impact, moisture or overload, and that distinction decides who pays. Then check the rest of the shipment for the same mode, because a pallet failure rarely happens alone. Report the finding to the supplier with the photographs and the loading conditions, and ask for a written cause rather than a replacement, since the cause is what prevents the next failure.

How should a pallet be stored before loading?

Dry, on a pallet rack rather than on a floor, and wrapped if the dock is humid. A paper pallet that sits on a wet floor for two days before loading has already lost part of its rating, and the loss is invisible until the container arrives. Mark the storage instruction on the shipping document, and inspect the pallets at loading for soft edges and separated deck layers. A rejected pallet at loading costs one pallet; a failed pallet in a container costs a repack and a claim, and the difference is a storage habit rather than a product change.

What does a teardown show that a photograph does not?

It shows whether the failure is impact, moisture or overload. A clean break at the deck edge with compressed cells points to impact, a soft separated edge with dark fiber points to water, and a buckled stringer with an intact deck points to bending under a rack load. Each leads to a different fix, and a photograph cannot separate them. Keep the failed section, cut it open, and photograph the section with a scale. That evidence is what turns a claim into a correction, and it is the reason the purchase order should require the damaged part to be retained.