5515.91.00.40 - Satin weave or twill weave (628)

HTS code 5515.91.00.40 specifically classifies woven fabrics of synthetic staple fibers that are mixed mainly or solely with man-made filaments, and are characterized by a satin weave or a twill weave. This category encompasses fabrics where the weave structure creates a smooth, lustrous surface (satin) or a diagonal ribbed pattern (twill), distinguishing them from other weave types.

This classification differs from its sibling categories by its specific weave construction. For instance, 5515.91.00.10 covers poplin or broadcloth weaves, 5515.91.00.20 addresses sheeting, and 5515.91.00.30 applies to printcloth. The "Other" category (5515.91.00.90) serves as a catch-all for woven fabrics of synthetic staple fibers, mixed with man-made filaments, that do not fall into the specifically defined weave types of satin, twill, poplin, broadcloth, sheeting, or printcloth.

As a leaf node in the HTS system, this category does not have further subdivisions. Therefore, classification within 5515.91.00.40 is determined by the presence of synthetic staple fibers, the primary inclusion of man-made filaments, and the definitive identification of either a satin or a twill weave. Practical classification relies on visual inspection and, if necessary, laboratory analysis to confirm the weave structure and fiber composition.