5501.40.00.00 - Of polypropylene

This category, HTS Code 5501.40.00.00, specifically covers synthetic filament tow made of polypropylene. Filament tow refers to a large bundle of continuous synthetic filaments that are loosely assembled and not yet spun into yarn. These bundles are typically characterized by their length and their lack of twist. The defining characteristic of this specific classification is the material composition: 100% polypropylene.

Distinguishing this category from its siblings, we find other types of filament tow based on their constituent materials. For instance, HTS Code 5501.20.00.00 pertains to filament tow of polyesters, while the category "Of nylon or other polyamides" covers filament tow made from these specific polymers. Additionally, "Acrylic or modacrylic" (5501.30.00) denotes tow made from acrylic or modacrylic fibers. The "Other" category (5501.90.01.00) serves as a catch-all for filament tow made from man-made materials not otherwise specified. Therefore, the crucial determinant for classification under 5501.40.00.00 is the identification of polypropylene as the sole or primary material.

As this node is a leaf node in the HTS classification structure, there are no further subcategories or subdivisions. Classification under HTS Code 5501.40.00.00 is definitive once the material has been identified as polypropylene. This material's inherent properties, such as its chemical resistance and relatively low density, contribute to the specific applications and end-uses of polypropylene filament tow, differentiating it from tows of other synthetic polymers.