ISPM 15 applies to solid wood packaging material used to support, protect, or carry a commodity — including pallets, crates, and cable-drums. Exemptions exist for processed wood products such as plywood or oriented strand board, and for packaging made entirely of thin wood. Importers should confirm with USDA APHIS whether their specific packaging qualifies and that the IPPC mark is present and legible.

Pallet collars — the stackable wooden frames placed on top of a flat pallet to create a box-like enclosure — are explicitly named in heading 4415 alongside pallets and load boards, so they fall under subheading 441520 rather than being classified as general wooden articles. Confirm the specific 10-digit line with your broker, as the collar's construction and whether it is presented with or without a pallet can affect classification.