5503.20.00.15 - Bi-component fibers having an outer copolymer sheath that melts at a lower temperature than the core, of a kind used for bonding fibers together

This HTS code, 5503.20.00.15, specifically covers bi-component synthetic staple fibers manufactured from polyester. These fibers are characterized by a unique construction where an outer sheath, made of a copolymer, has a lower melting point than the inner core material, which is also polyester-based. The primary purpose of these bi-component fibers is to act as bonding agents, enabling other fibers to be joined together through heat activation of the lower-melting sheath. They are not yet carded, combed, or otherwise processed for direct spinning into yarn, but are intended for further manipulation in textile manufacturing processes.

At this level of classification, the distinction lies in the specific functional design of these polyester staple fibers. While the broader category "Of polyesters" (5503.20) encompasses all staple polyester fibers not carded, combed, or otherwise processed, 5503.20.00.15 singles out those with a specific bi-component structure and a defined bonding function. Other polyester staple fibers within the broader category might be homogenous (single material) or designed for different textile properties and applications.

As this is a leaf node within the HTS, there are no further subcategories. Classification at this level is determined by the precise material composition (polyester core and copolymer sheath) and the inherent functional characteristic (lower melting outer sheath for fiber bonding). Therefore, any bi-component polyester staple fiber exhibiting these specific physical and functional attributes will fall under this classification.