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Understanding Propylene Glycol : A Chemical Profile Propylene Glycol (IUPAC name: propane-1,2-diol) is a synthetic organic compound with the chemical formula C₃H₈O₂. It is a viscous, colorless, and nearly odorless liquid that is completely miscible with water, as well as a broad range of organic solvents like acetone and chloroform. Propylene glycol is a synthetic, organic compound with the chemical formula C₃H₈O₂. It is a clear, colorless, odorless, and slightly viscous liquid that is highly soluble in water, alcohol, and many organic solvents. Propylene glycol is classified as a diol, meaning it contains two hydroxyl (-OH) groups, which contribute to its hygroscopic (moisture-attracting) and solvent properties. It is widely used across various industries, including food, pharmaceuticals, cosmetics, and ... Propylene glycol (C3H8O2) is a versatile chemical compound used as a solvent, humectant, and emulsifier in various industries, including food, pharmaceutical, and cosmetics. It’s also used in antifreeze and de-icing solutions. Propylene glycol is a common food and cosmetics ingredient deemed generally safe by US and European food authorities. However, its use in antifreeze has caused some health concerns.