Definition
The specific time and temperature protocol followed during the heat treatment process for ISPM-15 compliance. A treatment schedule defines the kiln temperature ramp-up rate, the target core temperature, the required hold time at temperature, and the cooling process. Schedules vary depending on wood species, thickness, initial moisture content, and kiln capacity. Accurate schedule adherence, verified by calibrated temperature probes, is essential for regulatory compliance.
Related Terms
Heat Treatment
A phytosanitary treatment method approved under ISPM-15 in which wood packaging material is heated until the core temperature reaches a minimum of 56 degrees Celsius (132.8 degrees Fahrenheit) for at least 30 continuous minutes. Heat treatment kills insects and pathogens without chemicals, making it the preferred method for treating export pallets. Treated wood is stamped with the HT mark as part of the ISPM-15 compliance marking.
Core Temperature
The temperature measured at the center (thickest point) of a piece of wood during heat treatment. Under ISPM-15, the core temperature of wood packaging material must reach at least 56 degrees Celsius (132.8 degrees Fahrenheit) for a minimum of 30 continuous minutes. Monitoring core temperature with calibrated probes is essential for verifying treatment compliance. Failure to achieve the required core temperature means the wood is not properly treated.
Kiln Schedule
A detailed set of operating parameters (temperature, humidity, air velocity, and time) used to control the drying process in a lumber kiln. Kiln schedules are tailored to the wood species, thickness, and initial moisture content to achieve the desired final moisture level without causing drying defects like checking, splitting, or case hardening. In heat treatment operations, the kiln schedule must also ensure ISPM-15 core temperature requirements are met.
ISPM-15
International Standards for Phytosanitary Measures No. 15, an international standard developed by the International Plant Protection Convention (IPPC) that governs the treatment of wood packaging materials used in international trade. ISPM-15 requires that wood packaging be debarked and treated by an approved method — primarily heat treatment or methyl bromide fumigation — to prevent the spread of invasive pests and diseases across borders.
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