Glycidoxypropyltrimethoxysilane

Glycidoxypropyltrimethoxysilane (CAS 2530-83-8), also marketed as Silane A-187 and KBM-403 and abbreviated GPTMS, is an epoxy-functional silane coupling agent used to chemically bridge inorganic substrates and organic polymer matrices.

It improves adhesion at interfaces where bonding between dissimilar materials would otherwise fail under mechanical or environmental stress. In adhesives, sealants, and epoxy coatings, GPTMS acts as a primer or additive to strengthen adhesion.

This chemical strengthens bonds to glass, metals, and mineral fillers, directly improving durability and reducing delamination risk. Electronics manufacturers use it to treat glass fiber reinforcements and encapsulant systems.

It is essential for printed circuit boards and semiconductor packaging. In automotive and aerospace composite manufacturing, it functions as a surface modifier for mineral-filled polymer systems, improving wet strength retention.

Coatings formulators incorporate it as a crosslinker or adhesion promoter in sol-gel systems and UV-curable formulations applied to plastics and glass. GPTMS is supplied as a clear liquid, typically in drums, IBCs, and bulk quantities.

The product is suited to industrial procurement volumes and is available in technical grade for industrial applications. Higher-purity grades are also available for electronics and specialty coating applications.

Established specifications include technical and reagent-grade standards. Buyers should confirm purity levels and hydrolysis stability with the supplier prior to formulation to ensure compatibility with specific manufacturing processes.