HTS code 9902.10.61 covers "Siloxanes and silicones, di-Me, polymers with Me silsesquioxanes and polypropylene glycol mono-Bu ether (CAS No. 68554-65-4), greater than 70 percent by weight, with less than 8 percent percent by weight siloxanes and silicones, di-Me, polymers with Me silsesquioxanes and polyethylene-polypropylene glycol mono-Bu ether, less than 8 percent by weight poly(oxy(methyl-1,2-ethanediyl)), α-butyl-ω hydroxyl (CAS No. 9003-13-8), less than 2 percent by weight oxirane, methyl-, polymer with oxirane, monobutylether (CAS No. 9038-95-3), less than 8 percent by weight silanamine, 1,1,1, trimethyl (CAS No. 68909-20-6) and less than 1 percent by weight silicon dioxide (CAS No. 7631-86-9) (provided for in subheading 3824.99.92)" 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.