5509.41.00 - Single yarn

This HTS classification, 5509.41.00, encompasses single yarns composed of synthetic staple fibers, specifically those containing 85 percent or more by weight of such fibers and not intended for retail sale. The key defining characteristic here is the "single yarn" construction, meaning the yarn is made from a single strand of fibers twisted together, as opposed to being formed by plying or cabling multiple single yarns. This category is distinct from its sibling, 5509.42.00, which specifically covers multiple (folded) or cabled yarns of the same material composition.

The distinction between single and multiple/cabled yarns is crucial for accurate classification. Single yarns provide a foundational element for various textile applications, whereas multiple or cabled yarns offer increased strength, thickness, or specific textural properties due to their construction. This category's scope focuses on the fundamental, unplied form of synthetic staple fiber yarn, establishing its place in the broader textile yarn landscape.

Under this heading, further subdivisions exist to refine the classification based on the specific type of synthetic staple fiber. The subcategories, 5509.41.00.10 for polyvinyl alcohol (PVA) fibers and 5509.41.00.90 for other synthetic staple fibers, allow for a more precise identification of the yarn's material composition. This granular level of detail supports accurate tariff application and trade data collection by recognizing the variations in synthetic fiber types used in single yarn production.