1,2-two chloro ethane, that is, two chloro ethane, chemical formula for C2h4cl2, is a halogenated hydrocarbon, mainly used as vinyl chloride (polyvinyl chloride monomer) preparation process of intermediates, also used as solvents. It is colorless at room temperature with a liquid similar to chloroform odor, toxic, potentially carcinogenic, possible solvent substitutes include 1,3-and toluene. Dichloroethane also has a isomer: 1,1-two chloro ethane, also known as "Kai Two chlorinated ethane."