Propylene glycol (PG) is an excellent solvent for flavoring and pigment. Because of its low toxicity, it is used as a solvent for spices and edible pigments in the food industry.
Propylene glycol (PG) in the pharmaceutical industry is often used to manufacture all kinds of ointments, ointments solvent, softener and excipient, in the pharmaceutical industry as a mixture, preservatives, ointments, vitamins, penicillin and other solvents. Because propylene glycol and all kinds of spices have good mutual solubility, so it is also used as a cosmetic solvent and softener and so on.