3-Methacryloxypropylmethyldimethoxysilane

3-Methacryloxypropylmethyldimethoxysilane (CAS 14513-34-9) is a bifunctional organosilane coupling agent commercially known as KBM 502. It carries both a methacryloyl group and a dimethoxysilyl group within the same molecule, enabling it to bridge organic polymer matrices and inorganic substrates simultaneously.

In glass fiber-reinforced composites, the silane end hydrolyzes and bonds to silica surfaces while the methacrylate group copolymerizes with unsaturated resins, improving interfacial adhesion and wet strength retention. In UV- and peroxide-cured sealants and coatings, it functions as a reactive crosslinker, anchoring the cured network to metal, glass, or mineral substrates and reducing delamination under thermal cycling.

This product is supplied as a neat liquid and is registered under REACH. It is handled under HS code 2931.90.9010 for customs classification within the EU. Packaging formats typically include drums and intermediate bulk containers; buyers should confirm available grades and lot documentation directly with the supplier.