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.

Where is Glycidoxypropyltrimethoxysilane used?

• Adhesives, sealants and epoxy coatings: primer or additive to strengthen adhesion
• Glass, metals and mineral fillers: strengthens bonds, improving durability and reducing delamination risk
• Electronics: treatment of glass fiber reinforcements and encapsulant systems
• Automotive and aerospace composites: surface modifier for mineral-filled polymer systems, improving wet strength retention
• Coatings: crosslinker or adhesion promoter in sol-gel systems and UV-curable formulations applied to plastics and glass
• It improves adhesion at interfaces where bonding between dissimilar materials would otherwise fail under mechanical or environmental stress.
• In mineral-filled plastics it allows higher filler loading and increases water vapor, acid, and base resistance.
• It eliminates the need for a separate primer in polysulfide and urethane mastics.
• It can be coated on aluminum alloy surfaces for corrosion protection.

Good to know: Buyers should confirm purity levels and hydrolysis stability with the supplier prior to formulation to ensure compatibility with specific manufacturing processes.

Formulation notes

• It is highly reactive in water.
• It is the equivalent of GLYMO.

Typical specification

• Viscosity of 3.2 cSt.
• Critical surface tension of treated surfaces is 38.55 mN/m.
• Color less than or equal to 50 APHA.

Storage, packaging and handling

• It is moisture sensitive.

Frequently asked questions about Glycidoxypropyltrimethoxysilane

In which application can glycidoxypropyltrimethoxysilane improve electrical properties?

In the wire and cable industry, when used to treat clay-filled EPDM system crosslinked by peroxide, it can improve power factor and specific inductance capacity.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.