Octyltriethoxysilane

Octyltriethoxysilane (CAS 2943-75-1) is an organosilane coupling agent and surface modifier used across coatings, sealants, and polymer systems. It bonds inorganic substrates to organic matrices, improving adhesion and water repellency. In coatings and sealants, it functions as a hydrophobic surface treatment for mineral fillers such as silica and calcium carbonate. This reduces moisture uptake and improves dispersion in the final formulation.

Silicone elastomers and rubber compounds use it as a crosslinking and compatibilization agent. This enhances mechanical performance and filler-polymer bonding for long-term durability in finished products. In plastics, it improves the interfacial adhesion between glass fiber reinforcements and polymer matrices. This directly affects tensile strength and processing consistency during the manufacturing stage.

Personal care formulators apply it to treat pigments and powders, producing surface-modified particles. These particles offer improved skin feel and oil dispersibility for high-end cosmetic applications. Octyltriethoxysilane is supplied as a clear liquid, typically in drums, IBCs, and bulk quantities suited to industrial procurement volumes. It is available in technical grade for industrial applications.

High-purity grades are offered for specialty coating and personal care end uses. Concentration and purity specifications vary by supplier, and buyers should confirm silane content with the technical datasheet. Buyers should also verify hydrolysis stability and compliance with relevant industrial standards. This ensures the material meets the specific requirements of the intended chemical formulation or process.