5402.39.31.10 - Of polyethylene (600)

This HTS subcategory, 5402.39.31.10, specifically classifies textured synthetic filament yarn, not put up for retail sale, that is made of polyethylene. The "Of polyethylene (600)" designation within the description pinpoints the material composition as the primary defining characteristic. This category encompasses yarns where the filaments have been mechanically or thermally processed to induce crimp, bulk, or loft, thereby altering their texture and performance properties compared to smooth filament yarns. These are not single filament strands but rather yarns composed of multiple filaments twisted or textured together.

The sibling category, 5402.39.31.90, covers "Other" textured single yarns of synthetic filaments not put up for retail sale. Therefore, this category, 5402.39.31.10, is distinguished by its specific material requirement – polyethylene – whereas the sibling category would encompass textured single yarns made from other synthetic polymers. The key differentiator lies in the precise polymer identification, ensuring accurate tariff application based on material sourcing.

As a leaf node within the HTS structure, there are no further subcategories branching from 5402.39.31.10. This signifies that the classification is sufficiently detailed at this level, with the combination of being a textured synthetic filament yarn (not for retail sale), a single yarn, and specifically of polyethylene, providing the definitive criteria for its identification. Classification at this level relies on the verifiable material composition and the inherent textured nature of the yarn.