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

Shin-Etsu KBM-903 3-Aminopropyltrimethoxysilane

Shin-Etsu KBM-903 is a high-purity 3-aminopropyltrimethoxysilane coupling agent from Shin-Etsu’s KBM series. It enhances adhesion between organic polymers and inorganic substrates like glass, metals, or fillers. Widely used in sealants, coatings, composites, and silica surface modification. Offers excellent hydrolytic stability, low viscosity, and strong amino–methoxy reactivity for covalent bonding.
  • shin etsu kbm 903 3 aminopropyltrimethoxysilane_50c86c56
  • shin etsu kbm 903 3 aminopropyltrimethoxysilane_50c86c56

Features Of Shin-Etsu KBM-903 3-Aminopropyltrimethoxysilane

  1. Highly reactive primary amine group enables strong covalent bonding with organic polymers and resins.

  2. Three hydrolysable methoxy groups ensure excellent crosslinking density and robust siloxane network formation.

  3. Superior hydrolytic stability compared to ethoxy analogues, supporting longer shelf life and formulation flexibility.

  4. Low volatility and favorable handling characteristics due to moderate molecular weight and boiling point.

  5. Proven compatibility with epoxy, phenolic, acrylic, and polyurethane systems for enhanced interfacial adhesion.

Typical Applications Of Shin-Etsu KBM-903 3-Aminopropyltrimethoxysilane

  1. Adhesion promoter in glass-fiber reinforced plastics (GFRP) and composite laminates.

  2. Surface modifier for silica, alumina, and other metal oxide fillers in rubber and thermoset composites.

  3. Coupling agent in epoxy-based structural adhesives and encapsulants for electronics packaging.

  4. Functional additive in waterborne coatings to improve pigment dispersion and substrate wetting.

  5. Pre-treatment agent for metal and mineral substrates prior to painting, bonding, or coating.

Specifications Of Shin-Etsu KBM-903 3-Aminopropyltrimethoxysilane

Chemical TypeOrganofunctional silane coupling agent
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Molecular FormulaC6H17NO3Si
Primary Functional GroupPrimary amine (–CH2CH2CH2NH2)
Hydrolysable GroupsThree methoxy (–OCH3) groups
Density (25°C)~0.945–0.955 g/cm³
Refractive Index (25°C)1.422–1.428


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