Under ISPM 15, all non-manufactured wood packaging materials (WPM) for export – including wood pallets, crating and loose wood dunnage – must be subjected to heat treating, either by heat or fumigation.
Manufactured wood products such as plywood, oriented strand board (OSB) and particle board do not need to be treated as any pests are destroyed during the manufacturing process.
Heat treating heats the wood until its core temperature reaches 56 degrees Celsius for at least 30 minutes. This process is widely recognized as an effective means to destroy any pests that could be harmful to forests. Wood can also be fumigated, but heat treating is considered an environmentally preferable alternative.
Once a wood pallet is treated, it never has to be treated again and is considered suitable for export and re-export, as long as none of the original components of the packaging is replaced. Once treated, the pallet or wood packaging must be marked with the internationally recognized IPPC markings, which indicate the country of origin and treatment method used.
Tri County heat treats to the ISPM15 standard. The intent of the ISPM15 standard is that once the WPM is treated and officially marked the treatment does not expire. Thus, you can reuse WPM without requiring re-treatment and remarking.
A list of the countries requiring a ISPM15 heat treatment are available here ISPM 15 Country List.