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

Evonik Dynasylan Si 69 Bis(Triethoxysilylpropyl)Tetrasulfide

Evonik Dynasylan Si 69 is a bifunctional silane coupling agent from the Dynasylan® series, featuring bis(triethoxysilylpropyl) tetrasulfide structure. It enhances rubber-to-metal adhesion in tire treads and steel-belted radial tires, improves silica dispersion in high-silica rubber compounds, and boosts mechanical performance, abrasion resistance, and wet grip while reducing rolling resistance.
  • evonik dynasylan si 69 bis triethoxysilylpropyl tetrasulfide_1f663554
  • evonik dynasylan si 69 bis triethoxysilylpropyl tetrasulfide_1f663554

Features Of Evonik Dynasylan Si 69 Bis(Triethoxysilylpropyl)Tetrasulfide

  1. Enhances adhesion between inorganic fillers (e.g., silica, silicates) and organic polymer matrices in rubber and thermoplastics.

  2. Acts as a bifunctional coupling agent with hydrolyzable triethoxysilyl groups and a reactive tetrasulfide bridge for covalent bonding to sulfur-cured elastomers.

  3. Improves mechanical properties including tensile strength, tear resistance, and dynamic fatigue performance in high-performance tires and industrial rubber goods.

  4. Reduces filler-filler interaction (Payne effect), enabling lower rolling resistance and improved wet grip in silica-reinforced tread compounds.

  5. Offers excellent hydrolytic stability in formulated masterbatches due to its controlled reactivity and shelf-life compatibility.

Typical Applications Of Evonik Dynasylan Si 69 Bis(Triethoxysilylpropyl)Tetrasulfide

  1. Silica-reinforced passenger and truck tire treads for high-performance and fuel-efficient compounds.

  2. Industrial rubber products including conveyor belts, hoses, and vibration dampers requiring enhanced filler-polymer coupling.

  3. Dynamic rubber components such as engine mounts and bushings where low heat build-up and long-term durability are critical.

  4. Specialty elastomer formulations using precipitated silica, fumed silica, or other silicate-based fillers.

  5. Thermoplastic vulcanizates (TPVs) and thermoplastic elastomers (TPEs) incorporating silica or glass fibers.

Specifications Of Evonik Dynasylan Si 69 Bis(Triethoxysilylpropyl)Tetrasulfide

Chemical TypeBis(triethoxysilylpropyl) tetrasulfide coupling agent
Product FormLiquid
AppearancePale yellow to amber clear liquid
Density (20 °C)1.18–1.20 g/cm³
Refractive Index (20 °C)1.495–1.505
Flash Point (PMCC)≥ 110 °C
Sulfur Content~15.5–16.5 wt%
Primary ApplicationsSilica coupling in sulfur-cured elastomers, especially tires and industrial rubber


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