5503.20.00 - Of polyesters

This category encompasses synthetic staple fibers made of polyester, specifically those that have not been carded, combed, or otherwise processed for spinning. This means the fibers are in a raw or semi-processed state, ready for further manufacturing processes like spinning into yarn. The defining characteristic is the material composition: polyester.

Within Chapter 55, this classification is distinguished from its siblings by its polyester origin. For instance, it is separate from fibers classified under 5503.10 (nylon or other polyamides), 5503.30 (acrylic or modacrylic), and 5503.40 (polypropylene). These sibling categories are defined by different polymer bases, indicating a distinct chemical composition and often resulting in different physical properties and end-use applications.

The subcategories under 5503.20 further refine the classification of polyester staple fibers. The primary subdivision separates "Bi-component fibers" with specific bonding properties from "Other" polyester staple fibers. Bi-component fibers are designed with distinct core and sheath materials that facilitate bonding when heat is applied, a specialized application for non-woven textiles and technical fabrics. The "Other" category captures all remaining polyester staple fibers that do not meet the specific criteria of bi-component fibers.