Silane coupling agent Vinyltrimethoxysilane, VTMO 1. CAS NO.: 2768-02-7 ... insoluble in the water if PH is 7, but soluble in water if PH is 3.0-3.5 ... and impact resistance.With the function of both coupling agent and crosslinking agent, its suitable polymers include polyethlene, polypropylene, unsaturated ... cool, dry place. Avoid light. Silane Coupling Agent - Vinyltrimethoxysilane(CAS No.: 2768-02-7)