Propylene glycol (PG) is a clear, odorless, and colorless liquid that is slightly viscous. It is a derivative of propylene oxide and has the chemical formula C3H8O2.
PG is primarily used as a humectant, which means it helps to retain moisture in products, such as cosmetics, food, and tobacco products. It is also used as a solvent, a heat transfer fluid, and a preservative in various industries, including pharmaceuticals, food, and cosmetics.
Additionally, PG is used in the production of unsaturated polyester resins, which are used in the construction and marine industries. It is also used in the manufacturing of polyurethane foams and other plastics.