9902.13.23 - Acrylic staple fiber (polyacrylonitrile staple), dyed, not carded, combed or otherwise processed for spinning, the foregoing containing by weight 92 percent or more of polyacrylonitrile, not more than 0.01 percent of zinc and 2 percent or more but not over 8 percent of water, with a decitex of 3.3 to 5.6, a fiber shrinkage of from 0 to 22 percent (provided for in subheading 5503.30.00)

This HTS code, 9902.13.23, specifically covers certain dyed acrylic staple fibers, also known as polyacrylonitrile staple. The defining characteristics for this classification include that the fibers are not yet prepared for spinning, meaning they are not carded, combed, or otherwise processed. Critically, these fibers must contain a high percentage by weight of polyacrylonitrile (92% or more), with very low levels of zinc (not exceeding 0.01%). Additionally, a specific water content range (2% to 8% by weight) and a decitex range of 3.3 to 5.6, along with a fiber shrinkage of 0% to 22%, are required for classification under this provision. The reference to subheading 5503.30.00 indicates that this temporary legislation modifies or adds to the base classification for acrylic staple fibers.

Given that this node is a leaf node within its chapter, there are no further subcategories to explore under 9902.13.23. Its purpose within Chapter 99 is to implement specific temporary import modifications or restrictions. This contrasts with the broad coverage of sibling categories within Chapter 99, which might address temporary legislation related to other goods or trade agreements, and with the primary HTS chapters that classify goods based on their inherent nature and function, rather than on temporary import restrictions. This provision is therefore an example of a temporary measure applied to a specific type of textile fiber.