HTS code 9902.13.24 covers "Artificial staple fibers of viscose rayon, not carded, combed or otherwise processed for spinning and containing 28 percent or more but not over 33 percent by weight of silica (provided for in subheading 5504.10.00); the foregoing other than fibers measuring 2.2 decitex in lengths of 38 mm, measuring 4.7 decitex in lengths of 51 mm or measuring 3.3, 4.7 or 5.0 decitex in lengths of 60 mm" 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.