Propylene glycol(PG)

CAS no. 57-55-6


Details

Colorless, viscous, and stable absorbent liquid, almost odorless, flammable, and low toxic. Compatible with water, ethanol, and various organic solvents. Boiling point 187.3 ℃. Melting point -60 ℃. Relative density is 1.0381. The refractive index is 1.4326. Surface tension (20 ℃) 38mNm. Viscosity (20 ℃) 60 5mPa s. Specific heat capacity (20 ℃) 2.49kj/(kg. ℃). Heat of vaporization (101.3kPa) 7Ukj/kg. Combustion heat (25 ℃) 1824 OkJ/mol。 Flash point (open cup) 99 ℃. The self ignition point is 415.5 ℃. The critical temperature is 352 ℃. The critical pressure is 6.1MPa.
It is a raw material for unsaturated polyester resin, epoxy resin, polyurethane resin, as well as plasticizers, surfactants, emulsifiers, and demulsifiers. In the food industry, it is used as the solvent of essence and food pigment, tobacco wetting agent, mildew inhibitor, fruit ripening preservative, pharmaceutical excipient, etc. It can also be used as an antifreeze, heat carrier, and lubricant for food machinery.

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