Silquest A-1289 Silane Bis-(triethoxysilylpropyl)tetrasulfide 40372-72-3 Crompton-OSI Specialties Crosslinking / Coupling / Curing Agents >> Silane Rubber - Elastomer (Chloroprene, Butyl …) Silquest® A-1289 Silane bis-(Triethoxysilylpropyl)tetrasulfide OSi Specialties Silquest® A-1289 silane is especially useful for sulfur-cured, mineral-filled rubber applications. Silica tires with lower rolling resistance, longer lasting, heat resistant belts or hoses, and lightweight shoe soles are some of the typical uses. Rubber goods also exhibit better abrasion resistance and wear life when this tetrasulfide silane is used to couple silica or other mineral reinforcements to the rubber. Bis-(Triethoxysilylpropyl)tetrasulfide. Used for sulfur-cured, mineral-filled rubber applications, to couple silica or other mineral reinforcement to the rubber. Provides good abrasion resistance and wear life.