Heat-Treated Pallets: What You Need to Know
If you\'re shipping internationally, HT pallets aren\'t optional. Here\'s everything you need to understand about ISPM-15 and what it means for your supply chain.
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What Is ISPM-15?
ISPM-15 stands for International Standards for Phytosanitary Measures No. 15. It is a regulation developed by the International Plant Protection Convention (IPPC) that governs all wood packaging materials (WPM) — including pallets, crates, and dunnage — used in international trade.
The regulation exists because wood packaging has historically served as a vector for invasive insects and tree diseases. The Asian Longhorned Beetle, the Emerald Ash Borer, and Pine Wood Nematode are all examples of pests that have caused devastating ecological and economic damage after arriving in solid wood packaging from international shipments.
ISPM-15 requires that all wood packaging materials be treated to kill potential pests before crossing international borders. Over 180 countries have adopted the standard.
The IPPC Mark: How to Identify a Compliant Pallet
Compliant pallets carry a permanent, legible mark on two opposing sides — typically burned, stamped, or branded into the stringer or block. The mark consists of:
The wheat-stalk logo to the left of the text is the IPPC certification symbol. If a pallet claims to be ISPM-15 compliant but lacks this mark, it is not compliant regardless of what anyone tells you.
Heat Treatment (HT) vs. Methyl Bromide (MB)
HT — Heat Treated ✓ Preferred
- · Core temperature raised to 56°C (133°F) for 30+ continuous minutes
- · No chemical residue
- · Safe for food-adjacent use
- · Accepted by virtually all countries
- · The industry standard
MB — Methyl Bromide ✗ Avoid
- · Chemical fumigation with methyl bromide gas
- · Classified as an ozone-depleting substance
- · Phase-out in many countries under Montreal Protocol
- · No longer accepted by the EU, China, and others
- · Chemical residue risk on food-contact surfaces
What Happens If You Ship Without HT Pallets?
Non-compliant wood packaging will be refused at customs. In the best case, this means your shipment is held while you arrange for replacement pallets in-country. In the worst case, your entire shipment is returned or destroyed at your expense. Fines and re-inspection fees apply in most countries.
The cost implication is severe: a $5,000 fine, a week of demurrage charges, and the cost of trans-loading cargo onto compliant pallets overseas can easily total $10,000–$25,000 for a single ocean container. The premium for HT pallets ($1–$2 over standard) is one of the most obvious ROI decisions in logistics.
Domestic Use: Do You Need HT Pallets?
For purely domestic shipments, ISPM-15 compliance is not legally required. However, many buyers specify HT pallets for domestic use as a quality signal — HT pallets from certified producers are generally better sorted and produced to tighter tolerances than uncertified inventory.
Some food retailers and pharmaceutical clients now require HT pallets for all incoming shipments regardless of origin, as part of their supply chain hygiene standards. If you\'re unsure what your customers require, ask them directly when onboarding a new account.
How to Order HT Pallets From Norwalk Pallets
Simply specify "ISPM-15 certified, HT stamped" when placing your order. We carry HT-certified inventory in all standard sizes and can provide a certificate of conformance for your shipping documentation. Lead times for HT inventory are typically the same as standard stock — 2–5 business days for in-region delivery.