Octyltriethoxysilane
Octyltriethoxysilane (CAS: 2943-75-1) is an organosilane coupling agent featuring a hydrophobic n-octyl chain and three hydrolyzable ethoxy groups attached to silicon. In the presence of moisture, the ethoxy groups hydrolyze to reactive silanols that condense onto silica, glass, metal oxides, and mineral surfaces, forming durable covalent bonds, while the octyl chain imparts strong water repellency and surface hydrophobization. This clear liquid is widely used as a surface modifier for fillers and pigments in rubber, plastics, and coatings, improving dispersion, reducing moisture pickup, and enhancing filler-polymer compatibility. It also serves as a water-repellent treatment for concrete, masonry, and stone in construction, and as a chain modifier in silicone resin synthesis. With its balanced reactivity and hydrophobic performance, octyltriethoxysilane is a versatile agent for surface engineering, protective treatments, and advanced composite formulations.
– Hydrophobic Surface Treatment: Applied to concrete, brick, stone, and facades as a penetrating water repellent that prevents moisture ingress while maintaining vapor permeability.
– Filler and Pigment Modification: Used to treat silica, talc, and mineral fillers, improving hydrophobicity, dispersion, and compatibility in rubber and plastic compounds.
– Coatings and Inks: Incorporated into architectural and industrial coatings to enhance water resistance, adhesion, and durability on mineral substrates.
– Silicone Resin Synthesis: Serves as a building block and modifier for silicone resins, imparting flexibility and hydrophobic character to the final polymer network.
Product Name: Octyltriethoxysilane
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