5512.21.00 - Unbleached or bleached

This HTS category, 5512.21.00, specifically classifies woven fabrics composed of 85 percent or more by weight of synthetic staple fibers, where these synthetic fibers are primarily acrylic or modacrylic. The defining characteristic of this sub-classification is that these fabrics are **unbleached or bleached**. This means the fabric has undergone either no dyeing or finishing processes beyond initial preparation, or has been bleached to a lighter, uniform color.

The sibling category, 5512.29.00, covers woven fabrics of synthetic staple fibers (containing 85% or more by weight of synthetic staple fibers) that are dyed, printed, or have patterns. Therefore, the key distinction lies in the finishing process: 5512.21.00 is for unfinished or bleached fabrics, while 5512.29.00 applies to fabrics that have undergone further color treatment or decorative application.

Within this classification, further subdivisions exist to detail specific types of weaves and fabric constructions for unbleached or bleached acrylic or modacrylic woven fabrics. These subcategories, such as poplin, sheeting, printcloth, duck, and satin or twill weaves, allow for more precise identification based on the fabric's construction and intended application. The inclusion of specific weave types reflects the importance of textile construction in HTS classification, enabling accurate duty assessment and trade tracking.