Export Shipping: The Pallet Rules That Trip Up New Shippers

Your Pallet Has to Clear Customs Too

New exporters spend weeks getting their product, paperwork, and freight forwarder lined up, and then get blindsided by the one thing they never thought about: the pallet under the load. Wood packaging material is regulated at international borders, and if the pallet does not meet the rules, the entire shipment can be held, fumigated at your expense, refused entry, or in the worst case destroyed.

The reason is not bureaucratic pettiness. Raw wood can harbor insects and fungi that become devastating invasive pests when carried to a new continent. Countries protect their forests and agriculture by demanding that any wood packaging crossing their border be treated to kill anything living inside it. That demand is codified in an international standard, and it applies to almost every wooden pallet, crate, and dunnage piece in global trade.

The good news is that compliance is straightforward once you understand it. The bad news is that nobody tells a first-time exporter about it until something goes wrong. At Cincinnati Pallet we supply export-ready pallets and help local shippers avoid exactly this trap, so here is what you actually need to know.

What ISPM-15 Actually Requires

The rule that governs wood packaging in international trade is called ISPM-15, short for International Standards for Phytosanitary Measures No. 15. It was developed under the International Plant Protection Convention, or IPPC, and adopted by most of the world's trading nations. If you ship raw wood packaging across an international border, ISPM-15 almost certainly applies.

ISPM-15 approves a small number of treatment methods to sterilize the wood. The most common by far is heat treatment. The wood must reach a core temperature of at least 56 degrees Celsius and hold it for a minimum of 30 continuous minutes. That heat penetrates the wood and kills insects, larvae, and fungi throughout the material, not just on the surface. A newer method uses dielectric heating, and chemical fumigation with methyl bromide is still permitted in some cases though it is being phased out in many regions.

Crucially, the treatment must happen at a facility certified and audited under the program, because the compliance stamp can only be applied by an authorized treater. You cannot heat-treat pallets in your own oven and stamp them; the certification and traceability are the whole point of the system.

Reading the IPPC Stamp

A compliant pallet carries a stamp that customs officers around the world recognize on sight. Learning to read it lets you verify at a glance whether a pallet is export-ready before it ever leaves your dock. The stamp is usually branded or stenciled onto the stringers or blocks and contains a specific set of elements.

Here is what each part of the mark tells you. If any element is missing or the stamp is illegible, treat the pallet as non-compliant.

• The IPPC logo: a stylized symbol, often described as a wheat stalk or ear of grain, that identifies the mark as an official phytosanitary certification.
• A country code: two letters (for example US for the United States) showing where the treatment was performed.
• A unique facility number: identifies the specific certified treater, providing traceability back to the source.
• A treatment code: HT for heat treatment, DB for debarked, MB for methyl bromide fumigation, DH for dielectric heating.
• No painting or coloring requirement, but the mark must be legible, permanent, and not in red or orange (colors reserved to avoid confusion with hazard markings).

The Mistakes That Get Shipments Rejected

The most common failure is simply using an untreated pallet, often because someone grabbed whatever was on the dock for a shipment that unexpectedly turned into an export. Domestic recycled pallets are usually not treated, so the default pallet in your yard is very likely non-compliant for overseas freight. You have to specifically source ISPM-15 stamped pallets for export loads.

A subtler mistake is contaminating a compliant pallet. Once a pallet is treated and stamped, adding new untreated wood, repairing it with untreated boards, or attaching untreated blocking can void its compliance in the eyes of an inspector. Any repair to an ISPM-15 pallet must use treated components and, in many cases, the pallet must be re-marked. Do not patch an export pallet with random yard lumber.

Shippers also get caught by assuming heat treatment is the same as kiln drying, or that a stamp from one facility is transferable. It is not. Each pallet must carry its own valid, legible mark. And remember that some countries have additional or stricter requirements on top of the baseline, so check the destination's rules with your freight forwarder before you ship.

Heat Treated Is Not the Same as Chemically Treated

One point causes constant confusion, so it is worth stating plainly. Heat treatment, marked HT, involves no chemicals at all. It is purely a matter of raising the wood's core temperature to 56 degrees Celsius for at least half an hour. Heat-treated pallets are clean, safe to handle, and acceptable for a wide range of goods including many food and pharmaceutical applications.

That is very different from chemical fumigation with methyl bromide, marked MB, which uses a toxic gas and is being restricted or banned in a growing number of countries. For most exporters today the right and expected choice is heat treatment. When you order export pallets, specify HT and confirm the stamp reflects it.

This distinction matters for buyers on the receiving end too. If a customer specifies that pallets must be chemical-free, an HT stamp is your proof. There are no residues from heat treatment because the process is entirely thermal.

How to Set Up for Export Without Drama

The clean way to handle export pallets is to treat them as a separate, controlled category in your operation. Keep a dedicated stock of ISPM-15 stamped pallets, store them apart from your domestic pool so they do not get mixed up, and never repair them with untreated wood. Build the habit that any international shipment pulls from the compliant stock, no exceptions.

Plan ahead on volume. Certified treatment takes facility capacity and lead time, so a last-minute export order is exactly when people grab the wrong pallet. If you export regularly, keep enough stamped pallets on hand to cover a normal cycle, and reorder before you run out.

Cincinnati Pallet supplies heat-treated, ISPM-15 compliant pallets and can advise on the right specification for your destination and product. If you are shipping overseas for the first time, talk to us before the freight is booked, not after customs has flagged it. Getting the pallet right is one of the cheapest parts of an export shipment to fix, and one of the most expensive to get wrong.