DEFECTS OF HALOGENATED SOLVENTS ARE NOT ONLY A TOXICOLOGICAL OR ENVIRONMENTAL CONCERN Halogenated solvents include any chlorinated, brominated or fluorinated solvents. The most common are dichloromethane (DCM), perchloroethylene (PER), trichloroethylene (TCE) n.bromopropane (nPB), hydrofluorocarbons (HFC), and hydrochlorofluorocarbons (HCFCs). They all have a major defect, which is their density DCM 1330 kg/m3 TCE 1500 kg/m3 TCE