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Propylene glycol 100% is a clear, colorless and hygroscopic liquid, also called propane-1,2-diol, is a synthetic organic compound with the chemical formula C3H8O2. It is a viscous colorless liquid which is nearly odorless but possesses a faintly sweet taste. The freezing point of water is depressed when mixed with propylene glycol owing to the effects of dissolution of a solute in a solvent (freezing-point depression); in general, glycols are non-corrosive, have very low volatility and very low toxicity, however, the closely related ethylene glycol (a key ingredient in antifreeze) is extremely toxic to humans and fatally toxic to many animals.