ISPM-15 Exists for a Reason
The international plant protection standard ISPM-15 was adopted in 2002 to address a real problem: wood packaging material moving between countries was carrying invasive insect species across borders. The Asian Longhorned Beetle, the Emerald Ash Borer, and several other pests have caused billions of dollars of damage to forests in their introduced regions, and traceable evidence shows wood packaging was a significant vector.
The standard’s response is straightforward in concept: wood packaging entering an ISPM-15 country has to be either heat-treated or fumigated, and the treatment has to be certified with a visible stamp. The certification places legal responsibility on a registered facility to verify each batch was treated.
Most of the export world has adopted ISPM-15. The United States, Canada, Mexico, the European Union, China, Japan, Australia, and the major Latin American countries all require it. A handful of countries have additional requirements on top.
What the IPPC Stamp Actually Shows
The IPPC stamp (named for the International Plant Protection Convention that oversees ISPM-15) is the visible proof that a piece of wood packaging has been treated. The stamp includes four required elements: the symbol (the IPPC’s stalk-of-grain logo), the country code in two letters, the treatment facility identifier number, and the treatment code.
The country code is the ISO two-letter code for the country where the wood was treated, not where it was shipped from. A crate built in Miami using wood treated in Honduras shows the Honduras code, not the U.S. code.
The treatment code is either HT (heat treatment), MB (methyl bromide fumigation), or DH (dielectric heating). HT is by far the most common. MB has been phased out of most western markets because of environmental concerns about methyl bromide but is still used in some regions. DH is a newer technique that uses microwave or radio-frequency heating; it is approved but not widely deployed.
Some stamps include a fifth element, DB (debarked), which indicates the wood was debarked in addition to being treated. DB is required by some destinations but not all.
How Heat Treatment Works
Heat treatment for ISPM-15 requires the core of the wood to reach 56 degrees Celsius (133 degrees Fahrenheit) for at least 30 continuous minutes. The temperature is measured at the geometric center of the thickest piece in the batch, not at the surface. The 30 minute clock starts when the core reaches the target temperature, not when the kiln does.
In practice, hitting the core target temperature for green wood that arrives at the facility cold can take six to twelve hours of total kiln time. The treatment facility logs the temperature continuously and retains the records for inspection. A facility that cannot produce its core-temperature logs is not a compliant facility, regardless of what stamp it places on the wood.
The treatment is one-time. Wood that has been heat-treated once can be cut, shaped, assembled into a crate, and stamped without re-treatment, as long as the wood retains its ISPM-15 markings or the assembled crate is stamped with the facility’s mark.
Where Compliance Goes Wrong
A surprising number of export shipments out of Miami get rejected at destination for ISPM-15 issues. The most common failures are predictable.
The stamp is missing from one side of the crate. ISPM-15 requires the stamp on at least two opposite sides of each piece of wood packaging. A crate with the stamp only on one side fails on inspection.
The stamp is illegible. Stamps in faded or smeared ink, stamps that have been overstamped by shipping labels, stamps that have been damaged by water or rough handling are all treated by destination inspectors as no stamp. The remedy is to ensure the stamp is burned in or stamped in indelible ink, and to position the stamp where shipping labels will not obscure it.
The wrong wood is used. ISPM-15 applies to solid wood packaging material thicker than 6 mm. Plywood, OSB, and particle board are exempt because their manufacturing process involves heat that kills any pests. A crate built with a mix of solid wood and plywood needs the solid wood portion to be ISPM-15 compliant. Some shippers use plywood thinking the whole crate is exempt; that fails inspection if any solid wood is present.
The treatment is expired. ISPM-15 itself does not technically expire, but some destinations apply their own re-treatment requirements for wood that has been in storage for more than a few years. If you are reusing wood crates from a project completed three years ago for a current export, verify the destination’s re-treatment policy.
The Cost of a Rejection
A shipment rejected at destination for ISPM-15 non-compliance has three resolution paths, all expensive. The cargo can be re-exported at the shipper’s cost, sometimes back to origin and sometimes to a third country, with the shipper paying both directions of freight. The cargo can be treated at destination under destination authority supervision, with rates that often exceed the original crating cost and a multi-week delay. Or the cargo can be destroyed, with the shipper losing both the cargo and the freight.
Avoiding the rejection is much cheaper than resolving one. A pre-shipment ISPM-15 review by the crating partner that catches a missing stamp before the container leaves the yard saves a five-figure resolution downstream.
Go Freight Builds ISPM-15 Compliant Export Crates in Miami
Go Freight provides industrial crating with ISPM-15 compliant heat-treated wood, certified IPPC stamping on at least two opposite sides of each crate, retained treatment documentation, and pre-shipment compliance review on every export crate. We work with destination requirements across Latin America, the Caribbean, Europe, and Asia.
Call (786) 445-0150 or email rates@go-freight.ai for an export crating quote with full ISPM-15 documentation.