Introduction ChemicalName: Bis-[γ -(triethoxysilyl)-propyl]-tetrasulfide CAS No.: 40372-72-3 Molecular Formula: (H5C2O)3Si(CH2)3@S4@(CH2)3@Si(OC2H5)3 Foreign Company's Trademark: A-1289(America Union Carbon) KBE-846(ShinEtsu) 3221(Degussa) Typical Physical Properties Determined on commercial material whose properties may vary within the specification limits.
Physical Form Clear or light yellow Liquid Viscosity 11.2cSt Specific Gravity at 20° C 1.089± 0.005 Refractive Index, ND 25° C 1.4850± 0.0005 Sulfur Content Min 22
Applications Si-69 is a kind of silane coupling agent with multiple functional groups successfully used in rubber industry to improve modulus and tensile strength of rubber, to reduce the compound viscosity and save process energy consumption. It's especially applicable for polymers with double bond or rubber formulation with hydroxyl fillers. The suitable fillers include silica, silicate, clay, etc. The suitable rubber include natural rubber (NR), Butadiene styrene rubber (SBR), Isoprene rubber (IR), Butadiene rubber (BR), Acrylonitrile butadiene rubber (NBR), Ethylene propylene diene rubber (EPDM), etc.