What Is ISPM-15? The Complete Guide to Heat Treated Pallets for Export

If your business ships goods internationally from Los Angeles, you have almost certainly encountered the term ISPM-15. It is one of those requirements that can catch first-time exporters off guard and cause expensive delays at the port if not handled correctly. Whether you are shipping through the Port of Los Angeles, the Port of Long Beach, or any other international gateway, understanding ISPM-15 is essential for smooth, compliant export operations.

In this guide, we explain exactly what ISPM-15 is, why it exists, how the heat treatment process works, and what you need to know to ensure your pallets meet international standards every time.

What Does ISPM-15 Stand For?

ISPM-15 stands for International Standards for Phytosanitary Measures No. 15. It is a set of guidelines developed by the International Plant Protection Convention (IPPC), an agency under the United Nations Food and Agriculture Organization (FAO). The standard was first adopted in 2002 and has been updated several times since then.

In plain terms, ISPM-15 is an international regulation that requires all wood packaging materials used in international trade — including pallets, crates, dunnage, and skids — to be treated to eliminate pests that could be hiding in the wood. The goal is to prevent the spread of invasive insects and plant diseases from one country to another through untreated wood.

Why Was ISPM-15 Created?

The regulation exists because of a very real threat: invasive wood-boring insects. Untreated wood can harbor larvae, beetles, and other organisms that, when transported to a new environment, can devastate local forests and ecosystems. Some of the most damaging invasive species in recent decades have been traced back to wood packaging materials used in international shipping.

The Asian longhorned beetle, the emerald ash borer, and the pine wood nematode are just a few examples of destructive pests that have spread through untreated wood packaging. ISPM-15 was created as a global standard to address this problem and protect ecosystems worldwide.

The Heat Treatment Process Explained

The most common method for achieving ISPM-15 compliance is heat treatment, abbreviated as HT. Here is how the process works:

Temperature and Duration Requirements

The wood must reach a core temperature of 56 degrees Celsius (132.8 degrees Fahrenheit) and maintain that temperature for a minimum of 30 continuous minutes. This applies to the entire thickness of the wood, not just the surface. The heat must penetrate all the way to the center of the thickest piece of lumber in the pallet.

This specific temperature and duration combination has been scientifically proven to kill all known pest organisms that could be present in the wood, including eggs, larvae, and adult insects.

How Heat Treatment Is Performed

Certified treatment facilities use specially designed kilns equipped with temperature probes that monitor the core temperature of the wood throughout the process. The pallets are loaded into the kiln, the temperature is raised gradually, and once the core reaches 56 degrees Celsius, the 30-minute clock starts. The entire process, including ramp-up time, typically takes several hours depending on the wood thickness and moisture content.

The ISPM-15 Stamp

After successful treatment, the pallets are stamped with the official ISPM-15 mark. This stamp is your proof of compliance and includes several key pieces of information: the IPPC logo (a wheat symbol), the country code (US for the United States), the treatment provider's unique registration number, the treatment method (HT for heat treatment or MB for methyl bromide), and the two-letter country code where the treatment was performed.

Customs authorities at destination ports look for this stamp. Without it, your shipment can be held, inspected, fumigated at your expense, or even sent back to the origin country.

Which Countries Require ISPM-15 Compliance?

The short answer is: almost all of them. As of 2026, over 180 countries have adopted ISPM-15 requirements. This includes all major trading partners of the United States:

✓ Canada and Mexico
✓ All European Union member states
✓ United Kingdom
✓ China, Japan, South Korea, and most of Asia
✓ Australia and New Zealand
✓ Brazil, Argentina, and most of South America
✓ India and most of the Middle East
✓ Most African nations

If you are shipping internationally from Los Angeles, you should assume that ISPM-15 compliance is required unless you have verified otherwise for a specific destination.

Why ISPM-15 Matters for Los Angeles Businesses

Los Angeles is one of the largest export gateways in the United States. The Port of Los Angeles and the Port of Long Beach together handle a massive share of the nation's international cargo. Thousands of businesses across the Los Angeles metro area ship goods overseas every day, and every one of them needs ISPM-15 compliant wood packaging.

Non-compliance is not a minor issue. If your shipment arrives at a foreign port with non-compliant pallets, you could face any of the following consequences: the shipment is held at the port while inspectors examine the wood packaging, the pallets are fumigated at the destination at your expense, the entire shipment is rejected and returned to origin, fines are imposed by the destination country's customs authority, and your customer relationship suffers due to delivery delays.

For businesses that export regularly, the cost of non-compliance far exceeds the modest premium for using properly treated pallets from the start.

Common Mistakes with Export Pallets

Using Untreated Pallets for International Shipments

This is the most common mistake, often made by businesses that are new to exporting. Domestic pallets do not require heat treatment, so companies that have only shipped within the United States may not realize that international shipments have different requirements.

Assuming All Wood Pallets Are Treated

They are not. Standard domestic pallets are typically not heat treated unless specifically requested. You must explicitly order ISPM-15 compliant pallets and verify that they carry the proper stamp before loading your export shipment.

Mixing Treated and Untreated Wood

If you use ISPM-15 stamped pallets but add untreated dunnage, blocking, or bracing lumber to the shipment, the entire shipment can be flagged as non-compliant. All wood packaging materials in the shipment must be treated, not just the pallets.

Relying on Old or Damaged Stamps

The ISPM-15 stamp must be legible. If the stamp has worn off, been painted over, or is otherwise unreadable, customs may treat the pallet as non-compliant. Inspect your pallets before shipping to make sure the stamp is clearly visible.

Heat Treated Pallets vs. Plastic Pallets for Export

An alternative to heat-treated wood pallets is using plastic pallets, which are exempt from ISPM-15 because they are not a natural material and cannot harbor pests. Plastic pallets simplify export compliance but come at a significantly higher upfront cost.

For most Los Angeles exporters, heat-treated wood pallets offer the best balance of compliance, cost, and availability. The price premium for heat treatment over standard untreated pallets is relatively modest, especially when compared to the cost of plastic alternatives or the potential cost of a non-compliant shipment being held at port.

Cost of ISPM-15 Heat Treated Pallets

Heat-treated pallets cost more than standard untreated pallets, but the premium is reasonable. The exact price depends on the pallet size, grade, and order volume. For current pricing details, see our guide on pallet prices in Los Angeles for 2026.

When comparing costs, remember to factor in the potential cost of non-compliance: port fees, fumigation charges, shipment delays, and damaged customer relationships. Investing in properly treated pallets from the start is always the more economical choice.

Get ISPM-15 Compliant Pallets from Bro Pallets LLC

At Bro Pallets LLC, we supply ISPM-15 heat-treated pallets to exporters across Los Angeles and Southern California. Every heat-treated pallet we sell carries the proper ISPM-15 stamp and meets all international compliance requirements. We offer standard and custom sizes, competitive wholesale pricing on bulk orders, and reliable delivery throughout the region.

If you export goods from anywhere in the Los Angeles area, whether through the ports of LA and Long Beach, by air, or by land to Mexico and Canada, we can supply the compliant pallets you need to keep your shipments moving without delays.