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Propylene glycol, also called 1,2-propanediol or propane-1,2-diol, is an organic compound (a diol or double alcohol) with formula C3H8O2 or HO-CH2-CHOH-CH3. The compound is sometimes called α-propylene glycol to distinguish it from the isomer propane-1,3-diol HO-(CH2)3-OH, also called β-propylene glycol. Propylene glycol is a clear, colourless, slightly syrupy liquid at room temperature. It may exist in air in the vapour form, although propylene glycol must be heated or briskly shaken to produce a vapour. Propylene glycol is practically odourless and tasteless. [1,2]
