5515.91.00 - Mixed mainly or solely with man-made filaments

This category, HTS code 5515.91.00, encompasses woven fabrics manufactured primarily or exclusively from man-made staple fibers, where these fibers are mixed with other materials. The key characteristic is the presence of man-made staple fibers as the predominant component, combined with other fibers. This classification applies to fabrics that do not fall into more specific headings for woven fabrics of synthetic staple fibers, such as those primarily of filament yarns.

The sibling category, 5515.99, covers "Other" woven fabrics of synthetic staple fibers not specifically detailed elsewhere. The distinction lies in the composition; 5515.91.00 specifically addresses fabrics where man-made staple fibers are mixed, while 5515.99 would capture fabrics of synthetic staple fibers not fitting this mixed composition or other more specific classifications within Chapter 55. This ensures a precise categorization based on the fiber blend.

Within HTS code 5515.91.00, further subdivisions exist to account for different fabric constructions and uses. These subcategories, such as Poplin or broadcloth (5515.91.00.10), Sheeting (5515.91.00.20), Printcloth (5515.91.00.30), and Satin weave or twill weave (5515.91.00.40), as well as a residual "Other" category (5515.91.00.90), provide granular detail. These subdivisions are critical for customs purposes, allowing for more specific identification of the fabric's weave, construction, and intended application, facilitating accurate duty assessment and trade analysis.