M 9070 (OTTOKEMI) Methyldichlorosilane, 97% Cas 75-54-7 - used as a silane coupling agent to synthesis the hydrophilic and hydrophobic silica nanoparticles. M 9070 (OTTOKEMI) Methyldichlorosilane, 97% Cas 75-54-7 - used in the synthesis of polysilanes, which are precursors to silicon carbide.