HTS code 9902.13.23 covers "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)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.