Organo-silicon compounds
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Duty Rate (from China)
Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2931.90.90.10
Dimethyldichlorosilane
Dimethyldichlorosilane is a chemically defined organo-silicon compound with the formula (CH3)2SiCl2, used primarily as a precursor in silicone polymer production. It falls under HTS 2931.90.90.10 as an organo-inorganic compound where silicon is directly linked to carbon atoms, fitting Chapter 29's scope for separate organic compounds containing nonmetals like silicon.
Trimethylchlorosilane
Trimethylchlorosilane ((CH3)3SiCl) is a volatile organo-silicon reagent used in silylation reactions and silicone synthesis. Classified under HTS 2931.90.90.10 as it meets the definition of organo-inorganic compounds with silicon directly bonded to carbon, excluded from sulfonated/halogenated derivatives.
Vinyltrimethoxysilane
Vinyltrimethoxysilane (CH2=CHSi(OCH3)3) is a coupling agent used in composite materials and adhesives. As a chemically defined organo-silicon compound, it belongs to HTS 2931.90.90.10.
Diphenyldichlorosilane
Diphenyldichlorosilane ((C6H5)2SiCl2) is used in high-temperature silicone resin production. This aryl organo-silicon compound fits HTS 2931.90.90.10 criteria.
Methyltrichlorosilane
Methyltrichlorosilane (CH3SiCl3) is a basic silicone monomer. Classified under HTS 2931.90.90.10 as organo-silicon.
Triethoxysilane
Triethoxysilane (HSi(OC2H5)3) used in silane chemistry. HTS 2931.90.90.10 organo-silicon compound.
Hexamethyldisilazane
Hexamethyldisilazane ((CH3)3Si)2NH is an organo-silicon compound used as a surface modification agent and silylating agent in microelectronics. It qualifies for HTS 2931.90.90.10 as an organo-inorganic compound containing silicon directly linked to carbon, within Chapter 29's scope.
Tetraethylorthosilicate
Tetraethylorthosilicate (Si(OC2H5)4), also known as TEOS, is an organo-silicon compound used in sol-gel processes and chemical vapor deposition. It falls under HTS 2931.90.90.10 as a separate chemically defined organo-inorganic compound with silicon-carbon/oxygen linkages.
Polydimethylsiloxane (Low Molecular Weight)
Low molecular weight polydimethylsiloxane (PDMS) oligomers with defined chain lengths are classified as organo-silicon compounds. Under HTS 2931.90.90.10 when chemically defined and not meeting polymer exclusions, distinguished from Chapter 39 silicones.
Chlorotrimethylsilane
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.