9902.13.15 - 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 greater than 30 (provided for in subheading 5503.30.00)

This HTS category, 9902.13.15, pertains to specific acrylic staple fibers that meet stringent technical and performance criteria. These are polyacrylonitrile staple fibers, characterized by a high acrylonitrile content (85% or more by weight) and a precise water content (between 2% and 3% by weight). Furthermore, the fibers are colored and crimped, with a defined decitex range (1.98 to 2.42) and fiber length (40 to 47.5 mm). Crucially, importers must certify these fibers as having a solar reflectance index greater than 30, indicating a specific functional characteristic. This detailed specification points to a specialized application, likely related to energy efficiency or aesthetic solar reflection.

While the broader HTS system classifies fibers in Chapters 50 through 65, this particular entry falls under Chapter 99, which is reserved for temporary legislation and special provisions. This signifies that the classification of these acrylic staple fibers is subject to temporary modifications or additional import restrictions, as proclaimed under specific trade agreements or legislative acts, such as Section 22 of the Agricultural Adjustment Act. Therefore, this category does not directly compete with or overlap with the general classifications of fibers found in other chapters but rather represents a unique, temporary tariff treatment for goods that would otherwise be classified under a permanent HTS code. Its distinction from siblings within Chapter 99 lies in the specific set of technical and functional requirements that define the acrylic staple fibers it covers.

As a leaf node, HTS code 9902.13.15 does not have further subdivisions. Its precise definition and the associated temporary provisions are the sole focus of this classification. Consequently, the classification relies entirely on the importer's adherence to all enumerated physical and performance characteristics, including the certification of the solar reflectance index, and the prevailing temporary legislation that governs its import.