Softwood pulp (typically from pine or spruce) yields longer fibers prized for strength in packaging and tissue grades, while hardwood pulp (eucalyptus, birch) produces shorter fibers suited to printing and writing papers. These distinctions affect both HTS classification at the 10-digit level and mill purchasing specifications, so importers should confirm fiber species and pulp type with suppliers before finalizing contracts.

Standard commercial documentation — commercial invoice, packing list, and bill of lading — is required. Importers should also verify whether the pulp originates from certified sustainable forestry operations, as major buyers increasingly require chain-of-custody certification (e.g., FSC or PEFC) as a contractual condition, separate from US Customs requirements.