Chlorotrimethylsilane from Mexico
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 — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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)