If your business ships products internationally using wood pallets, crates, or dunnage, there is one regulation you absolutely cannot afford to ignore: ISPM-15. The International Standards for Phytosanitary Measures No. 15 is a global framework that governs the treatment and marking of wood packaging materials used in international trade. Non-compliance can result in shipment delays, costly quarantine fees, cargo rejection at foreign ports, and even hefty fines.
Yet despite its critical importance, ISPM-15 remains one of the most misunderstood regulations in the logistics world. Many businesses — especially small and medium-sized exporters — do not realize that their wood pallets must be treated and stamped before crossing international borders. At GreenCycle Pallets in Sunnyvale, California, we process thousands of pallets through our ISPM-15 certified heat treatment facility every year, and we frequently encounter customers who only learn about the requirement after a shipment has been held at customs.
This guide covers everything you need to know: what ISPM-15 is, why it exists, which countries enforce it, how treatment works, how to identify compliant pallets, and what happens when you get it wrong.
1What Is ISPM-15?
ISPM-15, formally known as “Regulation of Wood Packaging Material in International Trade,” is an international phytosanitary measure developed by the International Plant Protection Convention (IPPC), which operates under the United Nations Food and Agriculture Organization (FAO). It was first adopted in 2002 and has been revised several times since.
The standard applies to all wood packaging materials (WPM) made from raw, unprocessed wood — including pallets, crates, boxes, dunnage, skids, and other wood supports used to secure or carry cargo in international shipments. It does not apply to processed wood products such as plywood, particle board, oriented strand board (OSB), or veneers, as the manufacturing process for these materials eliminates pest risks.
The core purpose of ISPM-15 is to prevent the international spread of wood-boring insects and plant diseases that can devastate forests and ecosystems in importing countries. Untreated raw wood can harbor organisms like the Asian longhorned beetle, pine wood nematode, and emerald ash borer — invasive species that have caused billions of dollars in environmental damage worldwide.
2Why It Matters for Your Business
ISPM-15 compliance is not optional for international shipments using wood packaging. It is enforced by customs and agricultural inspection agencies at ports of entry around the world. Here is why it directly impacts your business:
Shipment Delays
Non-compliant shipments can be held at the destination port for inspection, adding days or weeks to your delivery timeline. During peak shipping seasons, these delays can cascade through your entire supply chain.
Financial Penalties
Depending on the country, fines for non-compliance can range from hundreds to tens of thousands of dollars per violation. Repeat offenders face escalating penalties and increased inspection rates for future shipments.
Cargo Rejection
In severe cases, the entire shipment may be refused entry and must be returned to the origin country or destroyed at the importer's expense. Imagine having a container of product worth $50,000 turned away because of a $5 pallet.
Mandatory Treatment at Destination
Some countries may allow non-compliant shipments to be fumigated or treated at the port of entry — but at the importer's expense. This treatment can cost $500–$2,000 per container and still causes significant delays.
Customer Relationship Damage
Repeated compliance failures reflect poorly on your business and can damage relationships with international buyers who depend on timely, hassle-free deliveries.
3Which Countries Require It?
As of 2026, virtually all countries that participate in international trade enforce ISPM-15 to some degree. More than 180 countries are signatories to the IPPC and have adopted or recognize the ISPM-15 standard. In practical terms, if you are exporting goods from Sunnyvale to anywhere outside the United States, you should assume ISPM-15 compliance is required.
Strictly Enforced
- European Union (all member states)
- Canada
- Australia & New Zealand
- China
- Japan & South Korea
- Brazil & Argentina
- India
- Mexico
- United Kingdom
- South Africa
Notable Enforcement Details
- Australia: Among the strictest enforcement globally; all WPM inspected
- EU: Random inspections at ports; non-compliance triggers quarantine
- China: Mandatory fumigation or treatment certificate required
- Canada: CFIA enforces; no methyl bromide treatment accepted
- Brazil: All WPM must bear IPPC mark; frequent inspections
Note: Even for shipments between the U.S. and Canada, ISPM-15 compliance is required for all wood packaging materials. Many businesses overlook this because they do not think of Canada as a “foreign” destination.
4How Heat Treatment Works
ISPM-15 approves two treatment methods for wood packaging materials. The most common — and the method we use at GreenCycle Pallets — is heat treatment (HT). The second method, methyl bromide fumigation (MB), is being phased out in many countries due to its ozone-depleting properties and is banned by Canada, the EU, and several other major trading partners.
Heat Treatment Process (HT)
Step 1: Preparation
Pallets are inspected for debris, contaminants, and structural defects. They are loaded into our industrial heat treatment chamber on racks that allow air circulation around all surfaces.
Step 2: Heating
The chamber is heated using a calibrated system. ISPM-15 requires that the core temperature of the wood reaches a minimum of 56°C (132.8°F) for a continuous period of at least 30 minutes. Temperature probes are placed in the thickest pieces of wood to ensure compliance.
Step 3: Monitoring
Our computerized monitoring system records temperature data throughout the treatment cycle. This data is logged and retained for auditing purposes. The entire heating process typically takes 4–8 hours depending on wood thickness and moisture content.
Step 4: Cooling & Marking
After the treatment cycle is complete, pallets are cooled gradually. Once cooled, each pallet is stamped with the official IPPC/ISPM-15 mark, which includes our facility code, treatment type (HT), country code (US), and the IPPC logo.
At GreenCycle Pallets, our heat treatment facility in Sunnyvale processes pallets year-round. We can treat standard-sized pallets within 24–48 hours of receiving them and provide full documentation for your export records. Our facility is regularly audited by USDA-APHIS to maintain our certification.
5How to Identify Compliant Pallets
Every ISPM-15 compliant pallet must bear the official IPPC mark. This mark is your guarantee that the pallet has been treated according to the standard. Here is how to read it:
The IPPC Mark Contains:
- IPPC Logo:The wheat-stalk symbol of the International Plant Protection Convention
- Country Code:Two-letter ISO code (US for United States)
- Producer Code:Unique number assigned to the treatment facility
- Treatment Type:HT (heat treatment) or MB (methyl bromide)
Example ISPM-15 Mark Format
[IPPC Logo]
US - 12345
HT
Look for this stamp on the stringer or block
The mark must be permanent and legible — typically applied via a branding iron (heat stamp) or stencil. It must appear on at least two opposite sides of the pallet. Painted, handwritten, or photocopied marks are not valid. If you receive pallets with missing, illegible, or suspicious marks, do not use them for international shipments.
6Penalties for Non-Compliance
The consequences of shipping non-compliant wood packaging internationally are severe and can affect your business in multiple ways:
Port Quarantine
$500 – $5,000+Your shipment is held while authorities inspect and decide its fate
Mandatory Treatment
$500 – $2,000Fumigation or treatment at the destination port, at your expense
Return Shipping
$2,000 – $10,000+If rejected, you pay to ship the entire container back to Sunnyvale
Cargo Destruction
Full cargo valueSome countries may destroy the shipment and the packaging
Regulatory Fines
$1,000 – $50,000Government fines for violating phytosanitary regulations
Increased Inspections
Ongoing costRepeat violations trigger 100% inspection rates on future shipments
The irony is that ISPM-15 compliance is relatively inexpensive — typically $1–$3 per pallet for heat treatment. When compared to the potential costs of non-compliance, the math is overwhelmingly in favor of using properly treated pallets for every international shipment.
Get ISPM-15 Compliant Pallets from GreenCycle
Our Sunnyvale facility provides certified heat treatment for any wood pallets, crates, or dunnage you need for international export. We offer treatment of your existing pallets, sale of pre-treated pallets from our inventory, documentation and treatment certificates for your records, and fast turnaround — typically 24–48 hours from receiving your pallets. Whether you are shipping to Vancouver, BC or to Shanghai, we ensure your wood packaging meets ISPM-15 requirements.