HTS code 9902.13.19 covers "Modacrylic staple fibers containing by weight 2 percent or more but not over 3 percent of water, not pigmented (ecru), crimped, with a decitex of 1.7 and fiber length of 38 mm (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.