Chlorotrimethylsilane from Japan
Chlorotrimethylsilane (TMSCl, (CH3)3SiCl) serves as a protecting group in organic synthesis. This organo-silicon compound with direct C-Si bonds is properly classified under HTS 2931.90.90.10 per Chapter 29 organo-inorganic provisions.
Duty Rate — Japan → United States
23.8%
Rate breakdown
9903.04.6211.3%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• ,Include GC/MS purity certificate; impurities >5% may trigger mixture classification
• Watch for stabilizer additions—must be for preservation/transport per note (f)