Chloroprene is the common name for 2-chlorobuta-1,3-diene (IUPAC name) with the chemical formula CH2=CCl-CH=CH2 Chloroprene is a colorless volatile liquid, almost exclusively used as a monomer for the production of the polymer polychloroprene, a type of synthetic rubber. Chloroprene is a colorless, flammable, carcinogenic, chlorinated hydrocarbon with a pungent, ethereal odor. Chloroprene is used as a chemical intermediate in the manufacture of neoprene rubber. Exposure to this substance causes damage to the skin, lungs, CNS, kidneys, liver and depression of the immune system. Chloroprene is a mutagen and carcinogen in animals and is reasonably anticipated to be a human carcinogen. Chloroprene, stabilized appears as a clear colorless liquid. Flash point -4°F. May polymerize exothermically if heated or contaminated. If polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air. Used to make neoprene rubber.