5506.90.01.00 - Other

This HTS category, 5506.90.01.00, encompasses synthetic staple fibers that have undergone carding, combing, or other processing preparatory to spinning, but which are not specifically classified under the preceding subheadings of this chapter. It serves as a residual category for man-made staple fibers processed in this manner when their specific chemical composition (e.g., nylon, polyester, acrylic, polypropylene) is not explicitly listed in other 5506 subheadings. The key characteristic is the fiber's readiness for spinning into yarn, having been mechanically treated to align and prepare the fibers.

This subheading is distinguished from its siblings by the absence of specific material identification. For instance, 5506.10.00.00 covers staple fibers of nylon or other polyamides, while 5506.20.00.00 is for polyesters, 5506.30.00.00 for acrylic or modacrylic fibers, and 5506.40.00.00 for polypropylene fibers. Therefore, 5506.90.01.00 is the appropriate classification for processed synthetic staple fibers where the material does not fall into these defined categories or if the material composition is not readily identifiable and specified.

As this is a leaf node, there are no further subdivisions. The classification under this subheading relies on identifying synthetic staple fibers that have been carded, combed, or otherwise processed for spinning, and for which a more specific material-based subheading within 5506 does not apply. This often includes fibers made from less common synthetic polymers or blends of synthetic polymers not explicitly enumerated.