5402.49.91 - Other

This HTS classification, 5402.49.91, encompasses "Other" synthetic filament yarn that is not sewing thread and is not put up for retail sale. It falls under the broader category of synthetic filament yarn, excluding monofilament of less than 67 decitex. Within this group, it specifically covers single yarns that are either untwisted or have a twist not exceeding 50 turns per meter. The "Other" designation signifies that it does not fit into more specific subheadings within 5402.49.

Distinguishing this category from its sibling, 5402.49.11.00, is crucial. The sibling is specifically for colored multifilament yarn made of modacrylic, with a very low twist (less than 5 turns per meter), a specific decitex per filament range, and a declared use in doll wig manufacturing. In contrast, 5402.49.91.00 is a broader category for other types of synthetic filament yarn that do not meet these precise specifications, including yarns that may be of different materials, colors, twists, or intended for general industrial or commercial use.

The subcategories under this heading further refine the classification based on the yarn's construction and twist. These include "Monofilament; multifilament, untwisted or with twist of less than 5 turns per meter," and "Multifilament, with twist of 5 turns or more per meter." This division allows for precise classification based on whether the yarn is a single filament or composed of multiple filaments, and the degree of twist applied, which significantly impacts the yarn's properties and applications.