Propylene glycol CAS 57-55-6 , also called propane-1,2-diol, is an organic compound with the chemical formula C3H8O2. It is a viscous colorless liquid which is nearly odorless but possesses a faintly sweet taste. Chemically it is classed as a diol and is miscible with a broad range of solvents, including water, acetone, and chloroform.

Propylene glycol is colorless liquid with steady viscosity and good water absorption.It is nearly odorless,uninflammable and almost nontoxic. It can be mixed and solved with alcohol,water and various organic agents.