Propylene Glycol is a colorless, odorless liquid approved by the FDA as a direct food additive for use as a preservative in food and tobacco products. It is also used as a solvent in pharmaceuticals. Composition Propylene glycol (C 3 H 8 O 2 ) is a 3-carbon compound derived from propylene, a by-product of gasoline manufacture . It contains two hydroxyl (OH-) groups, located on carbons 1 and 2. Propylene glycol is manufactured by treating propylene with chlorinated water to form the chlorohydrin... Read More »
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