HTS code 2845.20.00.00 covers "Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined › Boron enriched in boron-10 and its compounds" 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.