Methyl Chloride CH3Cl Industrial Gases CAS No.: 74-87-3 EINECS No.: 200-817-4 UN No.: UN1063 Purity: 99.5%-99.95% Dot Class: 2.1 Appearance: Colorless Liquid Grade Standard: Industrial Grade, Refrigerant Grade Chemical Intermediate: The most important use of Methyl Chloride today is as a chemical intermediate in the production of silicone polymers. Chemical Intermediate: Smaller quantities are used as a solvent in the manufacture of butyl rubber and in petroleum refining. Chemical Intermediate: Methyl Chloride is employed as a methylating and chlorinating agent in organic chemistry.