Hexadecyltrimethoxysilane

Hexadecyltrimethoxysilane (CAS 16415-12-6), also known as Cetyl trimethoxysilane, is a long-chain alkylsilane used to chemically modify inorganic surfaces and impart hydrophobicity.

Where is Hexadecyltrimethoxysilane used?

• Coatings and sealants: treats mineral fillers such as silica, calcium carbonate and talc to improve dispersion and reduce moisture uptake
• Adhesives and elastomers: coupling agent that strengthens the interface between polymer matrices and glass or silica-based reinforcements
• Plastics compounding: surface-treated fillers deliver better mechanical performance and reduced agglomeration during processing
• Personal care: converts powder pigments and mineral actives from hydrophilic to hydrophobic surfaces, improving skin feel and water resistance in color cosmetics
• It bonds covalently to mineral substrates, enabling durable water repellency and improved compatibility between inorganic fillers and organic matrices.

Commercial specifications

• Purity 95% or higher, technical grade
• Packaging from small drums to bulk IBC containers