5503.30.00.00 - Acrylic or modacrylic

This HTS category, 5503.30.00.00, specifically covers acrylic or modacrylic staple fibers that have not undergone carding, combing, or any other processing for spinning. These are synthetic fibers, typically produced from polymers like acrylonitrile, which are then cut into short lengths. Acrylic fibers are known for their wool-like feel and are often used in clothing, upholstery, and carpets. Modacrylic fibers are a variation that offers enhanced flame resistance and durability.

Unlike its sibling categories, this classification is distinct because it exclusively addresses fibers derived from acrylic and modacrylic polymers. For instance, the sibling category 5503.20.00 pertains to polyester staple fibers, while 5503.40.00.00 covers polypropylene staple fibers. Another sibling, 5503.90, is a residual category for "other" synthetic staple fibers not otherwise specified. Therefore, the key distinguishing factor here is the specific chemical composition of the polymer forming the staple fiber.

As this is a leaf node in the HTS classification, there are no further subdivisions under 5503.30.00.00. Classification at this level hinges on confirming the material composition as acrylic or modacrylic. Importers and exporters must ensure that the goods precisely match the definition of raw, unspun staple fibers of these specific synthetic materials.