Propylene Glycol (PPG), also known as 1,2-propanediol, is a clear, colorless, nearly odorless, and slightly viscous liquid. It is miscible with water, alcohols, and many organic solvents, making it a versatile substance in numerous industries. Propylene Glycol is widely used as a solvent, humectant, emulsifier, and carrier fluid in pharmaceuticals, cosmetics, food, antifreeze formulations, and industrial applications. Depending on the purity, it is categorized as USP/FCC (food and pharmaceutical grade) or industrial grade.