Propylene glycol (PG) is a colorless, almost odorless, slightly viscous liquid with good water solubility. It is widely used as a humectant, solvent, emulsifier, and carrier in food, pharmaceuticals, cosmetics, and e-cigarettes. It also has significant applications in antifreeze and resin raw materials. While generally considered safe, caution is advised regarding potential sensitivity at high concentrations or in certain populations.. 

characteristic

· Physical properties : Colorless, transparent, slightly sweet, viscous liquid.

· Solubility : Easily soluble in water, ethanol, ether, etc.

· Moisture absorption : It has moisture absorption properties and can retain moisture.

· Safety : Generally recognized as safe by the FDA (GRAS) for food and cosmetic ingredients (USP/EP standard). 

Main uses

· Food : Solvents for sweeteners, flavorings, and colorings; humectants and softeners for food.

· Pharmaceuticals : solvents and carriers for oral, injectable and topical medications; skin disinfectants.

· Cosmetics : Moisturizers, emollients, solvents, thickeners (such as face masks, hand sanitizers) .

· E-cigarettes : used as a carrier and solvent for e-liquid.

· Industrial applications : Raw materials for automotive antifreeze, unsaturated polyester resins, and coatings.