Vinyltrimethoxysilane IOTA 5071 is colorless or yellowish transparent liquid, soluble in organic solvents such as alcohol, toluene, propanone, benzene, etc., hydrolyze in acidic aqueous.
3-Mercaptopropylmethyldimethoxysilane IOTA 5066 is a colorless transparent liquid, there is an unpleasant smell of sulfide. Does not dissolve in water, but soluble in alcohol, can react with water slowly.