Propylene glycol

Revision as of 14:36, 22 October 2022 by MDerrick (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search


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. In building shut down during the pandemic, propylene glycol was poured into drains to keep them moist, thus minimizing pest incursionsthrough the pipes.



Chemical structure

Propylene glycol.jpg

Synonyms and Related Terms

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


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

Physical and Chemical Properties

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

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

Resources and Citations

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