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

Shin-Etsu KBM-803 3-Mercaptopropyltrimethoxysilane

Shin-Etsu KBM-803 is a 3-mercaptopropyltrimethoxysilane coupling agent from Shin-Etsu’s KBM series. It enhances adhesion between organic polymers and inorganic substrates like glass, metals or fillers. The thiol (–SH) group enables covalent bonding with rubbers, resins and sulfur-cured systems, while methoxy groups hydrolyze to bond with siliceous surfaces. Widely used in tire cord adhesion, RTV silicones and functional coatings.
  • shin etsu kbm 803 3 mercaptopropyltrimethoxysilane_3a059f9a
  • shin etsu kbm 803 3 mercaptopropyltrimethoxysilane_3a059f9a

Features Of Shin-Etsu KBM-803 3-Mercaptopropyltrimethoxysilane

  1. Highly reactive thiol (–SH) group enables strong covalent bonding with metals, metal oxides, and sulfur-curable elastomers.

  2. Three hydrolyzable methoxy groups ensure rapid and uniform silanol formation for robust interfacial adhesion to inorganic substrates.

  3. Excellent compatibility with organic polymers, resins, and solvents facilitates easy incorporation into coating, adhesive, and sealant formulations.

  4. Enhances dispersion stability of fillers such as silica and carbon black in rubber compounds, improving mechanical performance.

  5. Acts as an effective coupling agent in hybrid organic–inorganic systems, promoting durable crosslinking under ambient or mild thermal conditions.

Typical Applications Of Shin-Etsu KBM-803 3-Mercaptopropyltrimethoxysilane

  1. Silica-reinforced tire tread compounds to improve wet grip, rolling resistance, and abrasion resistance.

  2. Adhesion promoters for metal-to-rubber bonding in automotive vibration dampers and engine mounts.

  3. Surface modification of glass, silica, and metal oxide nanoparticles for functional composites and coatings.

  4. Hybrid sol–gel precursors in corrosion-inhibiting primers and protective thin-film coatings.

  5. Thiol-functionalized matrix modifiers in dental restorative materials and biomedical device coatings.

Specifications Of Shin-Etsu KBM-803 3-Mercaptopropyltrimethoxysilane

Chemical TypeOrganofunctional alkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Molecular Weight238.4 g/mol
Specific Gravity (25°C)1.05–1.07 g/cm³
Refractive Index (25°C)1.435–1.445
Flash Point (Tag Closed Cup)≈ 95°C
SolubilityMiscible with common organic solvents (e.g., ethanol, toluene, acetone); hydrolyzes in water


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