Methyl chloride(methyl chloride，choromethane，CH3Cl), other name is chlormethane, colorless liquefied gas, stored in cylinders when pressurized liquefied. It has the ether odor and sweet. Relative molecular mass is 50.49. Liquid density is 0.92g/cm3(20/4℃). Gas density is 1.785g/L. Boiling point is -23.76℃. It is slight soluble in water, soluble in chloroform, ether, ethanol, and acetone. Not easy combustion and explosion. No corrosion. High temperature (400℃or above) and in bright light it can be broken down into methanol and hydrochloric acid, heating or meeting flame it generates phosgene.