Propylene Glycol

Definition - What does Propylene Glycol mean?

Propylene glycol (also known as 1, 2-propanediol) is a chemical compound with the molecular formula C3H8O2. It is an organic solvent clear in color, and corrosive to most metallic surfaces.

Corrosionpedia explains Propylene Glycol

It is important to use additional chemical inhibitors in conjunction to propylene glycol when it is applied to metallic surfaces.

The chosen corrosion inhibitor must be formulated for propylene glycol to protect metals from corrosion. Multi-metal inhibitors generally reduce the occurrence of corrosion via several mechanisms.

The incorporated propylene glycol inhibitor serves to modify metallic surfaces by absorption. This makes the surface less susceptible to electrochemical attack. The following are the key activities of a well-selected inhibitor that should be evaluated and closely monitored for continuous efficacy:

  • Buffering of organic acids formed as a result of glycol oxidation
  • Prevention of further acid formation
  • Compatibility and full functionality in glycol-water and glycol-ethanol mixtures
  • Good heat transferability
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