Propylene glycol

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A viscous hygroscopic liquid commonly used as a nontoxic antifreeze additive in food and drinks. Propylene glycol also acts as an inhibitor for mold and bacteria. Industrially, it is used as a solvent and emulsifier for synthetic resins, rosin, and essential oils. Propylene glycol oxidizes with mild heat to form acetic, pyruvic, and lactic acids.

Synonyms and Related Terms

1,2-propanediol; methyl glycol; 1,2-dyhydroxypropane; methylethylene glycol



Chemical structure

Propylene glycol.jpg

Other Properties

Miscible with water, acetone, chloroform. Soluble in ether.

Composition C3H8O2
CAS 57-55-6
Melting Point -59
Density 1.036
Molecular Weight mol. wt.=76.09
Boiling Point 188.2

Hazards and Safety

Ingestion and inhalation may cause minor problems. Skin contact may be irritating and defatting. Flammable. Flash point = 99C (210F)

Mallinckrodt Baker: MSDS

Sources Checked for Data in Record

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983
  • MSDS Sheet

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