Propylene Glycol TECH

Cas Number


Other Names

Propylene glycol

α-Propylene glycol



Methyl ethyl glycol (MEG)

Methylethylene glycol

The formula



Propylene glycol, also called propane-1,2-diol, is a synthetic organic compound. 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.

Physical and Chemical Properties
Physical state and appearance Colorless Liquid
Odor Odorless
Molecular Weight 76.09 g/mol
pH (1% soln/water): 6
Boiling Point 186 to 189°C
Flash point 104°C
Melting Point -59°C
Vapor Pressure: 0.011 k Pa
Vapor Density 2.6 [Air = 1]
Assay , wt % min 99.8
Sp. Gr. (25/25 ºc) 1.035 – 1.037
Colour, APHA max 10
Water, ppm max 700
Acidity, ppm as acetic acid max 30
Iron , ppm max 0.1
Chloride, wt . ppm max 1.0
Sulfate, wt . ppm max 10
Heavy metal, ppm max 5
Rsenic, wt . ppm max 1
Residue ppm max 20
Residue solvent pass
Gg wt . ppm max 50
Deg wt . ppm max 50
Distillation range (1 amt) ºc 186 – 189

Industrial propylene glycol is used as a heat transfer medium, to control viscosity, to dissolve active agents or protect against corrosion and pressure burst. It is also used as raw material for the production of unsaturated polyester resins (UPR).

It can be used as aircraft de-icer, enabling safe global public transport.

It can be used in paints and coatings, providing sustainable weather and wear protection.