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

Shin-Etsu KBM-802 3-Mercaptopropylmethyldimethoxysilane

Shin-Etsu KBM-802 is a 3-mercaptopropylmethyldimethoxysilane 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 rubber, resins, or sulfur-cured systems, while methoxy groups hydrolyze to bind siliceous surfaces. Widely used in tires, adhesives, and silicone-modified coatings for improved mechanical strength and durability.
  • shin etsu kbm 802 3 mercaptopropylmethyldimethoxysilane_93e2c09e
  • shin etsu kbm 802 3 mercaptopropylmethyldimethoxysilane_93e2c09e

Features Of Shin-Etsu KBM-802 3-Mercaptopropylmethyldimethoxysilane

  1. Highly effective coupling agent for sulfur-curable elastomers, enhancing interfacial adhesion between inorganic fillers and organic polymers.

  2. Contains both hydrolyzable methoxy groups and a reactive thiol (–SH) functional group, enabling covalent bonding with metal oxides and rubber matrices.

  3. Improved storage stability compared to triethoxysilane analogues due to controlled hydrolysis kinetics from dimethoxy substitution.

  4. Low volatility and favorable handling characteristics in industrial compounding processes.

  5. Enables reduced filler loading while maintaining mechanical performance—supporting lightweighting and cost-efficiency goals.

Typical Applications Of Shin-Etsu KBM-802 3-Mercaptopropylmethyldimethoxysilane

  1. Silica-reinforced passenger car tire tread compounds.

  2. High-performance rubber seals and hoses requiring dynamic fatigue resistance.

  3. Thermoplastic vulcanizates (TPVs) incorporating silica or glass fibers.

  4. Adhesion promoters in rubber-to-metal bonding systems.

Specifications Of Shin-Etsu KBM-802 3-Mercaptopropylmethyldimethoxysilane

Chemical TypeOrganofunctional alkoxysilane
Product FormLiquid
AppearanceColorless to pale yellow clear liquid
Molecular Weight222.36 g/mol
Specific Gravity (25°C)1.04–1.06 g/cm³
Refractive Index (25°C)1.455–1.465
Flash Point (COC)≥ 100°C
Shelf Life (unopened, 25°C)12 months


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