Perchloroethylene and hydrocarbon have been in use in drycleaning for many years. They are very different in origin and their properties differ. Perc is a synthetic non-flammable solvent with good solvency, while hydrocarbon solvents, a byproduct of crude oil, are flammable and have a much lower solvency power. Perc was developed as a solvent in 1920 […]