ISPM-15 Heat Treatment Standards for Wood Pallets

If your business ships products internationally, ISPM-15 compliance is not optional — it is a legal requirement enforced at borders around the world. A non-compliant pallet can stop your entire shipment, trigger expensive fumigation at the port of entry, or result in your cargo being turned back entirely. This guide explains exactly what you need to know to stay compliant.

What Is ISPM-15?

ISPM-15 stands for International Standards for Phytosanitary Measures No. 15. It is an international phytosanitary standard published by the International Plant Protection Convention (IPPC), a treaty organization under the United Nations Food and Agriculture Organization (FAO). The standard governs the treatment and marking of wood packaging material — including pallets, crates, dunnage, and packing blocks — used in international trade.

The purpose of ISPM-15 is straightforward: wood packaging that has not been treated can harbor invasive insects and plant diseases that could devastate forests and agricultural industries in the importing country. By requiring treatment before wood packaging crosses borders, ISPM-15 creates a global biosecurity barrier that protects ecosystems while still allowing free movement of goods.

Why ISPM-15 Was Created

The standard was developed in response to high-profile invasive species events caused by untreated wood packaging. The Asian Longhorned Beetle, which entered North America through wood packing from China in the 1990s, is one of the most cited examples. This beetle has caused millions of dollars in damage to trees across the northeastern United States and Canada. The Emerald Ash Borer — another invasive wood pest — has killed billions of ash trees across North America since its arrival in untreated wood.

ISPM-15 was formally adopted in 2002 and has been progressively implemented by more countries every year since. The standard has been updated over time, most notably with the 2013 revision that began phasing out methyl bromide fumigation as an approved treatment method.

Heat Treatment vs. Methyl Bromide

ISPM-15 currently recognizes two primary treatment methods, though one is being phased out:

• Heat Treatment (HT)

  Heat treatment requires that the wood be heated to a core temperature of 56°C (133°F) for a minimum of 30 continuous minutes. This kills insects and their larvae, fungal pathogens, and most other biological threats present in the wood. Heat treatment can be achieved through conventional oven heating, dielectric heating (microwave), or dehumidification kilning. HT is the globally preferred method and is accepted by virtually every country that has adopted ISPM-15.

• Methyl Bromide Fumigation (MB)

  Methyl bromide (MB) is a broad-spectrum pesticide that was previously widely used to fumigate wood packaging. It is highly effective at killing pests but is classified as an ozone-depleting substance under the Montreal Protocol. As a result, its use is being phased out globally. Canada, the United States, and China no longer accept MB as a compliant treatment for imports. Many other countries are following suit. If you currently use MB-treated pallets, it is time to transition to HT.

The IPPC Mark: How to Identify Compliant Pallets

Every ISPM-15-compliant pallet must bear the official IPPC mark, which is a wheat stalk symbol (the IPPC logo) accompanied by specific information. The mark must be legible, durable, and permanently affixed — typically as a branded or paint-stenciled mark on at least two opposite sides of the pallet.

The IPPC mark contains four elements:

Important: a pallet that has been repaired after treatment must be re-treated and re-marked. Simply adding or replacing boards does not preserve the original ISPM-15 certification.

Which Countries Require ISPM-15?

The vast majority of the world's major economies require ISPM-15-compliant wood packaging for imports. Key adopters include the United States, Canada, Mexico, the European Union (all 27 member states), the United Kingdom, Australia, New Zealand, China, Japan, South Korea, Brazil, and India. In total, more than 180 countries and territories have adopted the standard.

Domestic shipments within the United States do not require ISPM-15 compliance. However, if your products ever move across international borders — even through a third-party logistics provider — ISPM-15 compliance is essential. When in doubt, use compliant pallets for all shipments to avoid sorting and segregation costs.

Consequences of Non-Compliance

The consequences of shipping with non-compliant wood packaging are significant and immediate:

• Shipment detention at the port of entry pending treatment or re-export
• Mandatory treatment (fumigation) at the importer's expense at the border
• Refusal of entry and return of the entire shipment to origin
• Destruction of the wood packaging material
• Fines and penalties from customs authorities in the importing country
• Damage to commercial relationships with international buyers
• Significant delays in time-sensitive shipments

For perishable goods or time-sensitive industrial shipments, border detention can mean the difference between a profitable export and a total loss. The cost of using certified ISPM-15 pallets is negligible compared to the cost of a single non-compliant shipment detention event.

How to Source ISPM-15 Compliant Pallets

When purchasing pallets for international use, always request ISPM-15 certified pallets explicitly. At Raleigh EcoPallet, all pallets designated for export use bear the official IPPC mark with proper heat treatment certification. When you buy pallets from us, our team will confirm ISPM-15 status based on your intended use.

If you are purchasing new pallets, all standard wood pallets produced in the United States for export should already carry ISPM-15 certification, as treatment is standard practice for any reputable manufacturer. For used pallets, verification of the IPPC mark is essential before export use.

When in doubt about your specific requirements or destination country regulations, contact our team — we are happy to advise on the right product for your international shipping needs.

Maintaining Compliance After Treatment

• Never modify, repair, or add untreated wood to an ISPM-15 certified pallet without re-treatment
• Store certified pallets under cover to prevent re-infestation by insects or moisture-related biological growth
• Do not store certified pallets directly on bare soil, which can introduce pests
• Conduct visual inspections of the IPPC mark before each export use to ensure legibility
• Keep records of your pallet suppliers and their certification numbers for customs documentation if required
• Train receiving and shipping staff on how to identify and verify the IPPC mark

Common Questions from Exporters

• Do plastic pallets need ISPM-15 certification?

  No. ISPM-15 applies only to wood and wood-based packaging materials. Plastic, metal, and other non-wood pallets are exempt from the standard and require no phytosanitary treatment or marking for international use.

• Does domestic US shipment require ISPM-15?

  No. ISPM-15 is an international trade standard. Shipments moving entirely within the United States are not subject to ISPM-15 requirements, though some states have their own regulations for movement of wood materials.

• How long does ISPM-15 certification last?

  The certification applies to the initial treatment. There is no expiration date per se, but the pallet must not be modified with untreated wood after treatment, and the IPPC mark must remain legible. Pallets that show signs of new pest activity after treatment should not be used for export.

• Can I reuse ISPM-15 pallets?

  Yes, provided the pallet has not been modified with untreated wood and the IPPC mark is still intact and legible. A certified HT pallet that is in good structural condition can be reused for multiple export shipments.