5509.31.00.00 - Single yarn (604) 🖩

This HTS category, 5509.31.00.00, encompasses single yarns spun from synthetic staple fibers, specifically those containing 85 percent or more by weight of acrylic or modacrylic staple fibers. These yarns are not put up for retail sale, meaning they are typically intended for further manufacturing processes rather than direct consumer purchase. The "single yarn" designation is crucial, indicating that the yarn is formed from a single strand of twisted fibers, without being plied or cabled with other strands.

Distinguishing this category from its sibling, 5509.32.00.00, is the structure of the yarn. While both categories cover synthetic staple fiber yarns with a high acrylic or modacrylic content, 5509.31.00.00 is exclusively for single yarns. In contrast, 5509.32.00.00 covers multiple (folded) or cabled yarns, which are constructed by twisting two or more single yarns together. This distinction is based on the construction method of the yarn itself.

As this node represents a leaf node in the HTS database, there are no further subcategories. Therefore, classification within 5509.31.00.00 depends directly on the material composition (85% or more acrylic or modacrylic staple fibers), yarn structure (single yarn), and its presentation (not put up for retail sale). Examples of goods classified here would include single-ply acrylic yarns intended for weaving into fabrics, knitting into garments, or use in other industrial textile applications.