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

Shin-Etsu KBE-402 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane

Shin-Etsu KBE-402 is a reactive epoxy-functional silane coupling agent from the KBE series, featuring 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane as its core structure. It enhances interfacial adhesion between organic polymers and inorganic substrates like glass, metals, or fillers—widely used in composites, adhesives, coatings and encapsulants for improved mechanical strength, moisture resistance and durability.
  • shin etsu kbe 402 3 2 3 epoxypropoxy propylmethyldiethoxysilane_644673df
  • shin etsu kbe 402 3 2 3 epoxypropoxy propylmethyldiethoxysilane_644673df

Features Of Shin-Etsu KBE-402 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane

  1. Bifunctional silane coupling agent combining epoxy and alkoxysilane reactivity for enhanced interfacial adhesion.

  2. Contains a flexible propyl spacer between epoxy and silane moieties, improving compatibility with organic polymers and reducing brittleness.

  3. Diethoxy substitution provides balanced hydrolysis rate—sufficient stability for formulation handling and controlled reactivity during curing.

  4. Enables covalent bonding to both inorganic substrates (e.g., glass, metals, fillers) and organic matrices (e.g., epoxies, acrylics, polyurethanes).

  5. Low volatility and favorable storage stability under recommended conditions (cool, dry, nitrogen-blanketed).

Typical Applications Of Shin-Etsu KBE-402 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane

  1. Epoxy resin composites for aerospace and electrical insulation requiring high dielectric strength and moisture resistance.

  2. Surface treatment of silica, alumina, and calcium carbonate fillers in high-performance rubber and thermoset compounds.

  3. Adhesion promoters in structural adhesives and sealants for metal-to-polymer bonding in automotive assemblies.

  4. Functional additive in UV-curable and thermally cured epoxy-acrylate hybrid coatings for improved substrate wetting and corrosion protection.

  5. Primer component for glass fiber-reinforced polymer (GFRP) laminates in wind turbine blades and marine composites.

Specifications Of Shin-Etsu KBE-402 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane

Chemical TypeOrganofunctional alkoxysilane (epoxy-functional)
Product FormLiquid
AppearanceColorless to pale yellow transparent liquid
Primary ApplicationsCoupling agent, adhesion promoter, surface modifier
Key FeaturesEpoxy functionality + hydrolyzable ethoxy groups; flexible alkyl spacer
Recommended StorageUnder inert gas (N₂), at 5–30°C, protected from moisture and direct sunlight
Molecular Weight (calculated)262.4 g/mol
Refractive Index (25°C)1.425–1.435


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