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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If oxygen-function esters dominate classification
Esters of organic compounds classified to acid-function parent (last numerical order per note 3(A)), potentially shifting from silicon heading.
If industrial grade complex salts
If imported as silicates rather than pure organo-silicon, falls under Chapter 28 inorganic salts.
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Import Tips & Compliance
• Include hydrolysis stability data; stabilizers must qualify under Chapter 29 note (f) to avoid reclassification
• Declare CAS 78-10-4 and provide flash point/moisture sensitivity info for proper hazmat handling
Related Products 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.