Propylene glycol (pro-pan-diol, dioxypropane) represents colorless viscous liquid with slight characteristic smell, sweetish taste, possessing hygroscopic properties. Is diatomic alcohol. Exists in the form of two isomers: 1,2 propylene glycol and 1,3 propylene glycol. 1,3 Propylene glycol are more reactive, than 1,2 propylene glycol, and are inclined to polymerization.
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