9902.13.22 - Modacrylic staple fibers, not carded, combed or otherwise processed for spinning, containing over 35 percent and less than 85 percent by weight of acrylonitrile, 3.9 decitex (plus or minus 2 percent), natural in color, with fiber length between 38 mm and 120 mm (provided for in subheading 5503.30.00)

This HTS category, 9902.13.22, covers specific modacrylic staple fibers that are not yet prepared for spinning. The key defining characteristics include their composition, where they contain between 35% and 85% acrylonitrile by weight, and their physical properties, such as a decitex of 3.9 (within a 2% tolerance), a natural color, and a fiber length ranging from 38 mm to 120 mm. These fibers are further identified as being provided for under subheading 5503.30.00 in the main HTS structure, indicating their origin within the classification of synthetic staple fibers.

This classification exists within Chapter 99, which is reserved for temporary legislation and special provisions. It is crucial to differentiate this temporary classification from the permanent entries found in earlier chapters. For instance, while other chapters may cover finished textile products or raw materials for other industries, 9902.13.22 specifically targets this intermediate form of modacrylic fiber under a special, potentially time-limited, provision. Its existence here suggests a specific trade or regulatory concern that necessitates its distinct treatment outside the standard HTS chapters.

As a leaf node, this category does not have further subdivisions. Therefore, the classification hinges entirely on meeting the precise physical and compositional criteria outlined in its description. Importers must carefully verify that the modacrylic staple fibers imported strictly adhere to the specified acrylonitrile content, decitex, natural color, and fiber length to qualify for this particular HTS classification and its associated regulations or duties.