Yes. Preservative-treated lumber may fall under a different HTS subheading than untreated sawn wood of the same species, and the type of preservative (CCA, ACQ, copper azole) can be relevant to EPA registration requirements for the treatment chemical. Importers should confirm the correct HTS subheading based on both species and treatment status.

Wood chips and sawmill residuals are significant co-products traded internationally as feedstock for pulp and paper mills, biomass energy facilities, and composite wood panel manufacturers. Their HTS classification differs from sawn lumber, and they may be subject to different phytosanitary documentation requirements depending on the country of origin and species.