Propylene glycol is often used in electronic cigarettes to improve flavour and create a better throat hit.

A bottle of flavored ‘e-liquid’ for ‘vaping’ shows propylene glycol as the main ingredient. Propylene glycol is commonly used to deice aircraft. 

Propylene glycol is also used in various edible items such as coffee-based drinks, liquid sweeteners, ice cream, whipped dairy products and soda.Vaporizers used for delivery of pharmaceuticals or personal-care products often include propylene glycol among the ingredients. Propylene glycol is used as a solvent in many pharmaceuticals including oral, injectable and topical formulations, such as for diazepam  and lorazepam which are insoluble in water. Certain formulations of artificial tears, such as Systane, use propylene glycol as an ingredient.Like ethylene glycol, propylene glycol is able to lower the freezing point of water, and so it is used as aircraft deicing fluid. Water-propylene glycol mixtures dyed pink to indicate the mixture is relatively nontoxic are sold under the name of RV or marine antifreeze.Propylene glycol is frequently used as a substitute for ethylene glycol in low toxicity, environmentally friendly automotive antifreeze. It is also used to winterize the plumbing systems in vacant structures.Propylene glycol is used in veterinary medicine as an oral treatment for hyperketonaemiain ruminants. Glucose, which can be used in non-ruminants for this purpose, is not effective due to its consumption by the resident microbes of therumen.Propylene glycol is partially metabolized in the rumen to propianate which can be used as an energy source.

The remainder is absorbed into the bloodstream and used by the liver for gluconeogenesis.  C3H8O2Purity99.95%AppearanceColorless, Clear, Hygroscopic LiquidClassGeneral CargoCAS NO.57-55-6H.S Code29053200EINECS NO.200-338-0Moisture≤0.2Free Acid ppm≤75Ash ppm≤80Boiling Point188.2℃Molecular Weight76.09BRN NO.1340498Relative Density1.0362(20℃, 4℃)Refraction1.4329Flashing Point98.9℃(Close)/107℃(Open)ToxicityLowMelting Point-60