2931.90.90.10/Chlorotrimethylsilane/Japan

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

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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)