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

Shin-Etsu KBE-403 3-Glycidoxypropyltriethoxysilane

Shin-Etsu KBE-403 is a glycidoxy-functional silane coupling agent from the KBE series, featuring 3-glycidoxypropyltriethoxysilane as its active component. It enhances adhesion between organic polymers and inorganic substrates like glass, metals or fillers—widely used in composites, sealants, coatings and RTV silicones for improved mechanical strength and moisture resistance.
  • shin etsu kbe 403 3 glycidoxypropyltriethoxysilane_85653a8e
  • shin etsu kbe 403 3 glycidoxypropyltriethoxysilane_85653a8e

Features Of Shin-Etsu KBE-403 3-Glycidoxypropyltriethoxysilane

  1. High-purity organosilane with well-defined epoxy functionality for reliable coupling performance.

  2. Triethoxy silane group enables strong covalent bonding to inorganic surfaces (e.g., glass, metals, silica).

  3. Epoxy ring remains reactive after hydrolysis, allowing efficient covalent linkage to amine-, carboxyl-, or acid-anhydride-functionalized organic polymers.

  4. Excellent hydrolytic stability in alcoholic solvents prior to application, supporting consistent formulation handling.

  5. Low volatility and favorable viscosity for easy incorporation into coatings, adhesives, and composite resins.

Typical Applications Of Shin-Etsu KBE-403 3-Glycidoxypropyltriethoxysilane

  1. Adhesion promoter in epoxy-based structural adhesives for metal-to-composite bonding.

  2. Surface modifier for silica fillers in high-performance rubber compounds (e.g., tire treads).

  3. Interfacial coupling agent in fiber-reinforced polymer composites (glass/carbon fiber + epoxy resin).

  4. Functional additive in UV-curable hybrid sol-gel coatings for enhanced scratch resistance and substrate adhesion.

  5. Primer component for improving epoxy coating adhesion on aluminum, stainless steel, and concrete substrates.

Specifications Of Shin-Etsu KBE-403 3-Glycidoxypropyltriethoxysilane

Chemical TypeOrganofunctional alkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Molecular Weight236.35 g/mol
Specific Gravity (25°C)1.01–1.03 g/cm³
Refractive Index (25°C)1.422–1.428
Flash Point (PMCC)≥ 95°C
Storage Stability (unopened, 25°C)≥ 12 months


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