Chemical

Products

Perchloroethylene

Cas Number

127-18-4

Other Names

Perchloroethene,

Perchloroethylene,

Perc,

PCE

The formula

Cl2C=CCl2

Introduction

Tetrachloroethylene, also known under the systematic name tetrachloroethene, or perchloroethylene ("perc" or "PERC"), and many other names, is a chlorocarbon with the formula Cl2C=CCl2. It is a colorless liquid widely used for dry cleaning of fabrics, hence it is sometimes called "dry-cleaning fluid". It has a sweet odor detectable by most people at a concentration of 1 part per million (1 ppm).

Physical and Chemical Properties
Physical state and appearance Colorless liquid with ether-like odour
Odour Characteristic
Molecular Weight 165.8
Evaporation Rate 2.8
Boiling Point 121 °C
Flash point 128°C
Melting Point -22 C ( -8 F)
Specific Gravity 1.62
Viscosity 0.52 cSt @ 25°C
Vapor Pressure 13 mm Hg at 20 °C
Vapor Density 5.8
Solubility Insoluble in water
Purity, % wt 99.99
Density at 20° C, g/cm³ 1.623
Water, mg/kg 6
Residue on evaporation, % wt < 0.001
Applications

It is used as a alternative to chlorofluorocarbon (CFC) refrigerants.

It is also used in the synthesis of hydrochlorofluorocarbons (HCFCs) 123 and 124 and HFC 125.

Perchloroethylene is also an important solvent in dry cleaning industries. It is used in aerosol formulations for the automotive aftermarket, particularly for brake cleaning.