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

Shin-Etsu KBM-303 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane

Shin-Etsu KBM-303 is a cycloaliphatic epoxy-functional silane coupling agent from Shin-Etsu’s KBM series. It enhances interfacial adhesion between organic polymers and inorganic substrates like glass, metals or fillers. Widely used in UV-curable coatings, composites, and encapsulants for improved mechanical strength, moisture resistance and thermal stability. Its trimethoxy group enables hydrolysis and condensation, while the epoxycyclohexyl moiety offers high reactivity and low volatility.
  • shin etsu kbm 303 2 3 4 epoxycyclohexyl ethyltrimethoxysilane_48ca33fc
  • shin etsu kbm 303 2 3 4 epoxycyclohexyl ethyltrimethoxysilane_48ca33fc

Features Of Shin-Etsu KBM-303 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane

  1. Bifunctional silane coupling agent with epoxy and hydrolyzable methoxy groups for enhanced interfacial adhesion.

  2. Thermally stable cycloaliphatic epoxy ring enables high-temperature curing compatibility without premature decomposition.

  3. Hydrolytically stable trimethoxysilane moiety ensures reliable condensation with inorganic surfaces (e.g., glass, metals, silica).

  4. Low volatility and favorable handling characteristics compared to glycidyl-based silanes, supporting safer industrial processing.

  5. Enables covalent bonding between organic polymers and inorganic fillers—improving mechanical strength, moisture resistance, and long-term durability.

Typical Applications Of Shin-Etsu KBM-303 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane

  1. Surface treatment of mineral fillers (e.g., calcium carbonate, talc, silica) in epoxy and UV-curable resin systems.

  2. Adhesion promoter in composite laminates for aerospace and wind turbine blade manufacturing.

  3. Functional additive in radiation-cured coatings, inks, and adhesives requiring thermal stability and crosslink density.

  4. Reinforcement aid in silicone-modified epoxy encapsulants and potting compounds for electronics protection.

  5. Interfacial modifier in fiber-reinforced polymer (FRP) composites using glass or carbon fibers.

Specifications Of Shin-Etsu KBM-303 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane

Chemical TypeBifunctional epoxy silane coupling agent
Product FormLiquid
AppearanceColorless to pale yellow transparent liquid
Primary ApplicationsFiller surface treatment, adhesion promotion, composite reinforcement
Key FeaturesCycloaliphatic epoxy group, trimethoxysilane functionality, hydrolytic stability
BenefitsImproved interfacial bonding, enhanced moisture resistance, thermal stability up to 180°C
Storage ConditionsStore in tightly sealed containers under dry, cool conditions (≤25°C), protected from moisture
Shelf Life12 months from date of manufacture when stored properly


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