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

Shin-Etsu KBM-502 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane

Shin-Etsu KBM-502 is a reactive epoxy-functional silane coupling agent from Shin-Etsu’s KBM series. It features one glycidoxy group and two methoxy groups, enabling strong bonding between organic polymers and inorganic substrates like glass, metals or fillers. Widely used in composites, adhesives, coatings and rubber reinforcement for enhanced interfacial adhesion and moisture resistance.
  • shin etsu kbm 502 3 2 3 epoxypropoxy propylmethyldimethoxysilane_880f0010
  • shin etsu kbm 502 3 2 3 epoxypropoxy propylmethyldimethoxysilane_880f0010

Features Of Shin-Etsu KBM-502 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane

  1. Bifunctional silane coupling agent combining epoxy and methoxysilyl reactive groups for covalent bonding to both organic polymers and inorganic substrates.

  2. Enhances interfacial adhesion and moisture resistance in epoxy-based composites, coatings, and encapsulants.

  3. Offers improved hydrolytic stability compared to trialkoxysilanes due to the presence of a methyl group on the silicon center.

  4. Enables efficient surface modification of fillers (e.g., silica, alumina, glass fibers) prior to incorporation into thermosetting resins.

  5. Compatible with conventional epoxy curing agents and processing conditions without significant premature gelation.

Typical Applications Of Shin-Etsu KBM-502 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane

  1. Adhesion promoter in epoxy molding compounds for semiconductor packaging.

  2. Surface modifier for mineral fillers in high-performance electrical insulating composites.

  3. Functional additive in UV- and thermally curable epoxy-acrylate hybrid coatings.

  4. Interfacial coupling agent in fiber-reinforced polymer (FRP) laminates and prepregs.

  5. Moisture-scavenging component in low-dielectric encapsulation resins for microelectronics.

Specifications Of Shin-Etsu KBM-502 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane

Chemical TypeEpoxy-functional alkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Molecular Weight248.37 g/mol
Specific Gravity (25°C)1.02–1.04 g/cm³
Refractive Index (25°C)1.420–1.430
Flash Point (Tag Closed Cup)≥105°C
SolubilityMiscible with common organic solvents (e.g., acetone, ethanol, toluene); hydrolyzes in water


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