Sulfite-processed hardwood pulp in its unbleached form occupies a narrow but distinct niche, used where the sulfite process's characteristic softness and absorbency are needed without the added cost of bleaching. Classified under a single US tariff line, 4704190000, this product is distinguished from its soda/sulfate counterparts by the acid-based sulfite chemistry, which produces different residual lignin structures and fiber bonding properties. Importers should ensure mill documentation clearly identifies both the sulfite process and the nonconiferous (hardwood) species to support accurate classification.

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