Hexadecyltrimethoxysilane

Hexadecyltrimethoxysilane (CAS 16415-12-6) is a long-chain alkylsilane supplied under trade designations including DK572, Si 116, KH-1631, VP-Si 116, and Silane 116. It belongs to the silicones and silicates category and carries EC number 240-464-3 with no assigned E-code.

In coatings and sealant formulations, it bonds covalently to inorganic substrates through methoxy group hydrolysis, creating a hydrophobic surface layer that improves adhesion and moisture resistance. In personal care applications, the long C16 alkyl chain provides conditioning and emollient performance on hair and skin, while also functioning as a wetting agent to aid dispersion of active ingredients.

The material is available as a clear liquid and is registered under REACH. It falls under HS code 29319090 for customs classification. Procurement teams should confirm grade specifications and packaging formats directly with the supplier to ensure compliance with applicable regional and sector-specific requirements.