Propylene Glycol 99.9% in the pharmaceutical industry is often used to manufacture all kinds of ointments, ointment solvents, softeners, and excipients, 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, it is also used as a cosmetic solvent, softener, and so on.