2-dihydroxypropane Methyl ethyl glycol Trimethyl glycol Propylene glycol is sometimes confused with ethylene glycol, as both have been used in antifreeze due to their low freezing points.

Combinations with ethylene glycol (EG) are also important in biomedical applications. Poly(EG) (PEG) is one of the most commonly used biomedical polymers due to its specific properties.