Silquest A-189 silane offers an improvement in mineral-filled elastomer properties, including modulus, tensile and tear strength, heatbuildup, abrasion resistance, resilience, compression set and cure time may be achieved with SilquestA-189 silane (gamma-mercaptopropyltrimethoxysilane). Silquest A-189 silane chemically bonds reinforcing minerals such as silica, clay, mica and talc to the polymer matrix. This silane is especially useful insulfur-cured and metal oxide-cured elastomers. It can be used as a pretreatment on minerals or added at the time of compounding.