Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Shin-Etsu KBM-403 3-Glycidoxypropyltrimethoxysilane

Shin-Etsu KBM-403 is a glycidoxy-functional silane coupling agent from the KBM series, featuring 3-glycidoxypropyltrimethoxysilane as its active component. It enhances adhesion between organic polymers and inorganic substrates like glass, metals, or fillers—widely used in composites, coatings, adhesives, and RTV silicones for improved mechanical strength and moisture resistance.
  • shin etsu kbm 403 3 glycidoxypropyltrimethoxysilane_6cc61923
  • shin etsu kbm 403 3 glycidoxypropyltrimethoxysilane_6cc61923

Features Of Shin-Etsu KBM-403 3-Glycidoxypropyltrimethoxysilane

  1. Reactive epoxy functionality enables covalent bonding with organic polymers and thermosets.

  2. Hydrolyzable methoxy groups provide strong adhesion to inorganic substrates such as glass, metals, and fillers.

  3. Excellent hydrolytic stability in neutral to mildly acidic conditions prior to curing.

  4. Low volatility and favorable handling characteristics compared to chlorosilane alternatives.

  5. Proven compatibility with epoxy, phenolic, polyester, and acrylic resin systems.

Typical Applications Of Shin-Etsu KBM-403 3-Glycidoxypropyltrimethoxysilane

  1. Adhesion promoter in epoxy-based composite laminates and prepregs.

  2. Surface modifier for silica, alumina, and calcium carbonate fillers in rubber and plastic compounds.

  3. Bridge coupling agent in fiber-reinforced polymer (FRP) matrices for aerospace and automotive parts.

  4. Primer component in protective coatings for metal substrates requiring enhanced corrosion resistance.

  5. Functional additive in UV-curable epoxy acrylate formulations for electronics encapsulation.

Specifications Of Shin-Etsu KBM-403 3-Glycidoxypropyltrimethoxysilane

Chemical TypeOrganofunctional alkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Primary ApplicationsAdhesion promotion, filler surface treatment, resin modification
Key FeaturesEpoxy functionality + hydrolyzable methoxy groups
BenefitsImproved interfacial adhesion, enhanced mechanical properties, reduced moisture sensitivity
Molecular Weight236.3 g/mol
Boiling Point (760 mmHg)290 °C (decomposes)


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