HEAT-TREATED LUMBER / ISPM 15 CERTIFIED WOOD PACKAGING FOR EXPORT To meet phytosanitary requirements for international shipping, Tree Brand offers ISPM 15 certified Heat Treatment (H-T) services for lumber and finished crates, boxes, pallets, skids, cradles, and other custom wood packaging. Certified by Packaging Research Laboratory (PRL), Tree Brand utilizes the WPM Stamp, recognized by customs officials, and required on all H-T wood packaging, including Crates & Boxes, and Pallets & Skids shipped internationally. TBP’s technology features three H-T chambers and exposes lumber to temperatures up to 180 degrees Fahrenheit. H-T and ISPM 15 certification documents are available upon request from Tree Brand.