Octyltriethoxysilane

Octyltriethoxysilane (CAS 2943-75-1) is an organosilane coupling agent sold under trade names including Silquest A-137, Prosil 9234, Prosil 9202, and Y 9187. It carries no E-code designation and is classified under HS code 29310095 within the silicones and silicates category.

In coatings and sealant formulations, it bonds inorganic substrates to organic polymer matrices by forming covalent siloxane linkages at the mineral surface while the octyl chain compatibilises the surrounding resin. In personal care applications, it functions as a surface modifier and emollient by rendering pigment particles hydrophobic, improving dispersibility and skin feel in colour cosmetics.

Octyltriethoxysilane is supplied as a neat liquid and is subject to REACH registration requirements for EU import and use. Procurement teams should confirm grade specifications and SDS documentation with the supplier, as purity profiles vary between industrial and cosmetic-grade batches.