1,1-Dichloroethylene

Hazardous polymerization may occur. Usually contains inhibitors to prevent polymerization. Polymerization may be caused by elevated temperature, oxidizers, peroxides, or air. Uninhibited monomer vapor may form polymer in vents and other confined spaces.

At temperatures >0 deg and especially in the presence of oxygen or other suitable catalysts polymerizes to a plastic.

Inhibitors, such as the monomethyl ether of hydroquinone, are added to prevent polymerization.