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Si-69 Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide CAS 40372-72-3 Silane Coupling Agent KH-858
CAS No.:40372-72-3
Purity:99%
Place of Origin:Henan China
MF:C18H42O6S4Si2
Appearance:pale yellow transparent liquid
Certification:MSDS,COA,TDS
Free Samples
Silane coupling agent KH-858—chemically designated as Bis-[3-(triethoxysilyl)propyl] tetrasulfide—is a significant organosilicon compound. In the industrial sector, it is frequently referred to by trade names such as Si-69 and G-407, serving as a high-performance rubber additive. The molecular structure of this substance features two triethoxysilyl groups and a tetrasulfide linkage; this unique “dual-head” configuration endows it with the dual functionality of acting as both a coupling agent and a vulcanizing agent.
KH-858 finds its primary application within the rubber industry, particularly in the production of rubber goods requiring high tensile strength, superior abrasion resistance, and low rolling resistance. It is especially well-suited for rubber systems that utilize non-carbon black fillers—such as precipitated silica and silicates—as reinforcing agents. By enhancing the interfacial bonding between inorganic fillers and the rubber matrix, KH-858 significantly improves the rubber’s tensile strength, tear strength, and abrasion resistance, while simultaneously and effectively reducing hysteresis loss and rolling resistance, thereby extending the service life of the finished rubber products. Consequently, it is widely utilized in the manufacturing of high-performance tires, athletic shoe outsoles, rubber hoses, seals, and similar products. Basic Information
Product picture:
Function
Tires represent one of the primary application areas for KH-858, particularly in the manufacturing of high-performance “green” tires. In the formulation of tire tread and carcass compounds, precipitated silica is commonly employed as a reinforcing agent to reduce rolling resistance and enhance wear resistance.
In the field of footwear manufacturing, KH-858 is predominantly utilized in the production of outsoles for athletic shoes. Athletic shoe outsoles demand exceptional wear resistance, resilience, and grip. KH-858 serves to boost the tensile and tear strength of the outsole rubber, thereby ensuring its durability and resistance to abrasion during prolonged use. Furthermore, by improving the dynamic mechanical properties of the rubber, it enhances the outsole’s resilience, thereby elevating both wearer comfort and athletic performance.
Beyond tires and footwear, KH-858 finds extensive application in various industrial rubber products, such as hoses, conveyor belts, and seals. In these applications, KH-858 facilitates improved processing flowability of the rubber compounds, reduces mixing viscosity, and boosts production efficiency. Concurrently, it significantly enhances the products’ resistance to heat aging and dynamic fatigue, enabling them to maintain excellent sealing integrity and structural strength even when operating in harsh environments.
Technical Specifications:
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Item
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Standard
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Appearance
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yellow liquid
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Ethanol content，%
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≤0.5%
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γ2contentα
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≤3.0%
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Other impurity content β
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≤1.0%
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Sulfur content
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22±1%
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Package:
1kg / 200kg bucket
Palletized Shipping
Lead Time: 1-7 Days
Shipping Methods: Sea/Air/Express delivery
