ISPM 15 is an international standard that regulates wood packaging materials used in global trade. Its purpose is to prevent insects and diseases from hitching a ride inside wooden pallets, crates, and other shipping materials as goods move between countries. The standard requires that solid wood packaging be treated (typically with heat) and stamped with a certification mark before crossing international borders. Over 80 countries enforce it.
Why the Standard Exists
Raw, untreated wood can harbor invasive insects, fungi, and plant diseases. When a wooden pallet travels from one continent to another, any organisms living inside the wood travel with it. Invasive pests like the Asian longhorned beetle and the pine wood nematode have caused enormous ecological and economic damage after arriving in new regions this way. ISPM 15 was created by the International Plant Protection Convention (IPPC), a United Nations body, to set a universal baseline for treating wood packaging before it ships internationally.
Which Materials Are Covered
The standard applies to wood packaging materials (often abbreviated WPM) made from raw, solid wood. That includes pallets, skids, pallet collars, crates, boxes, cases, bins, reels, drums, load boards, and dunnage (the loose wood used to brace cargo inside a container). If it’s solid wood and it’s being used to support, contain, or protect a shipment in international trade, it almost certainly falls under ISPM 15.
Several categories of wood products are exempt because their manufacturing process already eliminates pest risks. These include plywood, oriented strand board (OSB), particle board, and veneer. Specialized gift boxes for items like cigars and wine are also exempt, as are heated wine and spirit barrels. Wood thinner than 6mm, wood shavings, sawdust, and wood wool don’t require treatment either. Attachments already fixed to shipping containers or vehicles are also excluded.
How Wood Gets Treated
The most common treatment method is heat treatment, labeled “HT” on compliant packaging. The wood must reach a core temperature of at least 56°C (about 133°F) and hold that temperature for a minimum of 30 continuous minutes. This kills the insects, larvae, and pathogens living inside the wood.
A newer option is dielectric heating, which uses microwave or radio frequency energy to heat wood from the inside out. This method requires a slightly higher core temperature of 60°C (140°F) for at least one continuous minute throughout the entire wood profile. It’s faster but less widely used than conventional heat treatment.
Methyl bromide fumigation was historically a common treatment option, though many countries have restricted or banned it due to its ozone-depleting properties. Research has shown alternatives like sulfuryl fluoride and phosphine can be effective against target pests in wooden pallets, but heat treatment remains the dominant method worldwide.
The IPPC Certification Mark
Treated wood packaging must carry a standardized stamp known as the IPPC mark. This mark contains several pieces of information: a two-letter country code identifying where the treatment was performed, a hyphen, and a producer or treatment provider code assigned by that country’s plant protection organization. The mark also includes an abbreviation for the treatment method used (HT for heat treatment, DH for dielectric heating, or MB for methyl bromide where still permitted). The familiar IPPC wheat-sheaf logo appears alongside this information.
Every element of the mark matters. Starting January 1, 2026, U.S. Customs and Border Protection will resume enforcing a requirement that a hyphen separate the country code from the producer code. Throughout 2025, APHIS temporarily suspended enforcement actions on shipments missing only that hyphen, giving manufacturers time to update their stamps. All other ISPM 15 provisions have remained fully enforced during that period.
Who Enforces It
Each country’s plant protection authority handles enforcement on its end. In the United States, that’s APHIS (part of the USDA) working alongside Customs and Border Protection. The IPPC maintains a public list of implementing countries, and it’s long: the U.S., Canada, China, Australia, Brazil, India, and the entire European Union all enforce the standard, along with dozens of countries across Africa, Asia, and Latin America. If you’re shipping goods internationally, it’s safe to assume the destination country requires ISPM 15 compliance.
What Happens With Non-Compliant Shipments
Shipping goods on untreated or improperly marked wood packaging can trigger serious consequences. Customs authorities may refuse entry to the shipment, require the goods to be re-exported, or order the non-compliant wood to be destroyed or treated at the importer’s expense. In the U.S., the costs go beyond logistics delays. Importers can face financial penalties based on three tiers of violation.
- Negligence: penalties up to the lesser of two times the lawful duties, taxes, and fees, or the domestic value of the product.
- Gross negligence: penalties up to four times the lawful duties, taxes, and fees, or the domestic value, whichever is less.
- Fraud: penalties up to the full domestic value of the product.
Beyond the fines themselves, a non-compliant shipment can mean late delivery fees from customers, the cost of sending a replacement shipment, and the loss of the original goods if customs destroys them. What looks like a small savings on cheaper, untreated pallets can quickly become one of the most expensive mistakes in a supply chain.
Practical Implications for Shippers
If you’re exporting goods, the simplest path to compliance is sourcing pallets and crating from a certified treatment provider who stamps every piece with the IPPC mark. Many pallet suppliers in major trading countries are already certified, so compliant materials are widely available and only marginally more expensive than untreated wood. For companies that want to avoid the ISPM 15 process entirely, using exempt materials like plywood pallets, plastic pallets, or corrugated packaging sidesteps the requirement altogether.
If you’re importing, it’s worth inspecting wood packaging for the IPPC mark before goods arrive at the border. Catching a problem at the supplier’s warehouse is far cheaper than dealing with it at customs. The mark should be visible, legible, and include all required elements: the IPPC logo, country code with hyphen, producer code, and treatment abbreviation.