Silquest A-189 Silane Gamma-mercaptopropyltrimethoxysilane 4420-74-0 Crompton-OSI Specialties Crosslinking / Coupling / Curing Agents >> Silane Rubber - Elastomer (Chloroprene, Butyl …) Silquest® A-189 Silane gamma-Mercaptopropyltrimethoxysilane OSi Specialties Product Description: Improvement in mineral-filled elastomer properties, including modulus, tensile and tear strength, heat buildup, abrasion resistance, resilience, compression set and cure time are achieved with Silquest® A-189 silane. Silquest A-189 silane chemically bonds reinforcing minerals such as silica, clay, mica and talc to the polymer matrix. This silane is especially useful in sulfur-cured and metal oxide-cured elastomers. It can be used as a pretreatment on minerals or added at the time of compounding. Silquest silanes are extremely versatile products that can react with a wide variety of organic and inorganic materials. Their unique ability as coupling agents, crosslinking agents, and surface modifiers has been proven in an ever-increasing number of applications, ranging from adhesives to coatings to foundry binder resins. Gamma-mercaptopropyltrimethoxysilane. Used in sulfur-cured and metal oxide-cured elastomers. Improves mineral-filled elastomer properties, including modulus, tensile and tear strength, heat buildup, abrasion resistance, resilience, compression set and cure. Chemically bonds reinforcing minerals such as silica, clay, mica and talc to the polymer matrix.