Heat Treatment and ISPM-15: Everything You Need to Know
ISPM-15 compliance is mandatory for international wood packaging. Understand the science behind heat treatment, the certification process, and how to ensure your pallets meet global standards.
Mike Reynolds
Ace Pallet Service · Published December 15, 2024
What Is ISPM-15?
ISPM-15, or International Standards for Phytosanitary Measures No. 15, is a global regulation governing wood packaging materials used in international trade. The standard requires that all solid wood packaging thicker than 6 millimeters be treated to eliminate pests before crossing international borders.
The standard was first adopted in 2002 in response to the spread of invasive insects through untreated wood packaging. Since then, over 180 countries have implemented ISPM-15, making it one of the most widely adopted international trade regulations.
ISPM-15 applies to pallets, crates, dunnage, and any other solid wood packaging in international shipments. It does not apply to processed wood products such as plywood or particle board, which are considered pest-free due to their manufacturing processes.
The Science of Heat Treatment
Heat treatment works by raising the core temperature of wood to a level that kills insects, larvae, and eggs. The ISPM-15 standard requires a minimum core temperature of 56 degrees Celsius maintained for at least 30 continuous minutes.
Commercial heat treatment is performed in industrial kilns or heat treatment chambers. Temperature probes embedded in the wood monitor core temperatures throughout the process. The cycle typically takes several hours because outer layers heat faster than the core.
Heat treatment also reduces moisture content, providing secondary benefits. Lower moisture reduces mold growth risk and improves dimensional stability. These benefits make heat-treated pallets preferable for many applications beyond international shipping.
The Certification Process
Treatment facilities must be certified by their national plant protection organization. In the United States, the American Lumber Standard Committee administers the ISPM-15 program on behalf of USDA APHIS.
Certification requires demonstrating proper kiln equipment, temperature monitoring systems, record-keeping procedures, and quality control processes. Facilities are audited periodically to maintain certification.
Ace Pallet Service maintains current ISPM-15 certification for our heat treatment operations. Our kilns are equipped with calibrated temperature probes, and we maintain detailed treatment records for every batch processed.
The IPPC Mark
Treated pallets must bear the IPPC mark, which includes the IPPC logo, the country code, the facility number, and the treatment code. The mark must appear on at least two opposite sides of the pallet and must be permanent and legible.
For heat-treated pallets, the treatment code is HT. For methyl bromide fumigation, the code is MB, though this treatment is being phased out globally. The mark must not be hand-written.
Pallets without proper IPPC markings will be treated as non-compliant at international borders regardless of actual treatment status. Ensure marks remain visible after loading and handling.
Common Compliance Mistakes
The most common ISPM-15 mistake is using untreated pallets for international shipments. This typically happens when someone grabs pallets from general inventory without checking for the IPPC stamp. A visual segregation system prevents this error.
Another frequent issue is pallets with damaged or illegible IPPC marks. Marks painted over, worn away by handling, or obscured by stretch wrap cannot be verified by customs inspectors.
Repairing treated pallets with untreated wood creates a compliance violation. Replacement boards must also be heat treated, or the entire pallet must be re-treated and re-stamped.
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