9902.13.13 - Acrylic staple fibers (polyacrylonitrile staple) containing 85 percent or more by weight of acrylonitrile units and 2 percent or more but not over 3 percent of water, colored, crimped, with a decitex between 1.98 and 2.42 and fiber length between 40 and 47.5 mm, certified by the importer as having a solar reflectance index less than 10 (provided for in subheading 5503.30.00)

This HTS classification covers specific acrylic staple fibers, also known as polyacrylonitrile staple. The defining characteristics for this entry are stringent: the fibers must contain 85% or more acrylonitrile by weight, and between 2% and 3% water content. Furthermore, these fibers are colored, crimped, and fall within a precise decitex range of 1.98 to 2.42, with a fiber length between 40 and 47.5 mm. Crucially, the importer must certify that these fibers possess a solar reflectance index less than 10. This specific tariff code is a temporary provision, referring to classification under subheading 5503.30.00, and is subject to special classification rules and potential import restrictions.

As a leaf node within the HTS database, this classification does not have further subdivisions. Its uniqueness lies in the precise technical specifications and the certified solar reflectance property, distinguishing it from other potential classifications of acrylic fibers that may not meet these stringent criteria or are not subject to the same temporary legislative provisions. The focus is on a highly specialized material with specific performance attributes, likely for particular industrial or construction applications as indicated by the solar reflectance requirement.