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Monoethylene Glycol (MEG)

Last updated: July 19, 2024

What Does Monoethylene Glycol (MEG) Mean?

Monoethylene glycol is a chemical substance that is produced by the reaction of ethylene or ethylene oxide. It is used as a corrosion inhibitor in antifreeze and in coolants, and in the manufacturing of polyester.

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Corrosionpedia Explains Monoethylene Glycol (MEG)

Monoethylene glycol is miscible in ethanol, acetone and water.

Monoethylene glycol is used as an inhibitor coating compound, which is a protective barrier in the form of a solid, film or fluid applied to a metallic surface to prevent corrosion. These barrier coatings possess chemical or physical properties that prevent corrosion reactivity and/or material degradation due to external factors.

Inhibitor coatings generate a passivation layer on the metal they protect, which prevents contact with water, chemicals and other corrosion causing materials. Passivation reduces the reactivity by electrochemical polarization.

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