Chloroethenes (abbreviated CEs throughout this article) of the general formula C2H4-xClx with x = 1, 2, 3, 4 are widely used in various industrial processes: The monosubstituted form, vinyl chloride (chloroethene), one of the world's most important commodity chemicals, is primarily used as monomer in the production of polyvinyl chloride (PVC), a widespread and versatile polymer. Among the three dichloroethene isomers, 1,1-dichloroethene also finds use as monomer in the synthesis of polymers. The cis and trans forms of 1,2-dichloroethene, which occur as byproducts in some processes, are in limited demand, with niche applications as solvents and cleaning agents. In contrast, trichloroethene is rather widely used, primarily in the degreasing of metal parts and as intermediate in the production of hydrofluorocarbons and other chemicals, with additional applications including industrial dry cleaning and the production of inks and paints. Finally, tetrachloroethene is applied in similar fields, notably in dry cleaning, as degreasing agent, and as feedstock in industrial syntheses. IUPAC names, frequently used synonyms and abbreviations as well as selected thermophysical properties of CEs are compiled in Table .