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

Shin-Etsu KBE-903 3-Aminopropyltriethoxysilane

Shin-Etsu KBE-903 is a high-purity 3-aminopropyltriethoxysilane coupling agent from Shin-Etsu’s KBE series. It enhances adhesion between organic polymers and inorganic substrates like glass, metals, or fillers. Widely used in sealants, coatings, and composites for improved mechanical strength, moisture resistance, and dispersion stability. Supplied as a colorless to pale yellow liquid with excellent hydrolytic stability and reactivity.
  • shin etsu kbe 903 3 aminopropyltriethoxysilane_5933b4af
  • shin etsu kbe 903 3 aminopropyltriethoxysilane_5933b4af

Features Of Shin-Etsu KBE-903 3-Aminopropyltriethoxysilane

  1. High-purity amino-functional silane with excellent hydrolytic stability due to optimized ethoxy group reactivity.

  2. Strong adhesion promotion between organic polymers and inorganic substrates such as glass, metals, and silica fillers.

  3. Enables covalent bonding via primary amine functionality, supporting crosslinking, surface modification, and coupling reactions.

  4. Low volatility and favorable handling characteristics compared to methoxy-substituted analogues.

  5. Consistent batch-to-batch performance validated under Shin-Etsu’s stringent quality control protocols.

Typical Applications Of Shin-Etsu KBE-903 3-Aminopropyltriethoxysilane

  1. Adhesion promoter in rubber-to-metal bonding systems for automotive components.

  2. Surface modifier for silica and clay fillers in high-performance tire tread compounds.

  3. Coupling agent in epoxy, phenolic, and polyurethane resin formulations for composites and encapsulants.

  4. Functionalization reagent for glass fibers used in reinforced plastics and printed circuit board laminates.

  5. Primer additive in protective coatings for corrosion-resistant steel and aluminum substrates.

Specifications Of Shin-Etsu KBE-903 3-Aminopropyltriethoxysilane

Chemical TypeAmino-functional trialkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow transparent liquid
Molecular Weight221.37 g/mol
Specific Gravity (25°C)0.946–0.952 g/cm³
Refractive Index (25°C)1.418–1.422
pH (1% aqueous solution)10.0–11.5
Storage Stability≥12 months in sealed container at room temperature (avoid moisture exposure)


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