Specification of Perchloroethylene: Item Standard Purity, % 99.5 min Water, ppm 50 max Alkalinity ( NaOH) , % 0.03 max Density ( P20, g/ cm3) 1.615-1.625 Colour ( Hazen) 15 max Non-volatile matter, % 0.005 max Application: Perchloroethylene ( Tetrachloroethylene) is used forsolvent, dry cleaning agent, extinguishant.