Silane Coupling Agent Crosile®970 is 3-Mercaptopropylmethyldimethoxysilane is a bifunctional organosilane with reactive organic mercapto groups and hydrolyzable inorganic methoxysilyl groups. 3-Mercaptopropylmethyldimethoxysilane is a clear, colorless to pale yellow liquid with a slight thiol odor. Soluble in alcohols, ketones and aliphatic or aromatic hydrocarbons.