HTS code 2846.90.40.00 covers "Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium, or of mixtures of these metals › Other › Mixtures of rare-earth oxides or of rare-earth chlorides › Yttrium bearing materials and compounds containing by weight more than 19 percent but less than 85 percent yttrium oxide equivalent" 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.