Propylene Glycol, USP. Food Grade Propylene Glycol (USP) is commonly used in closed loop systems as an antifreeze or heat transfer fluid, where there exists a potential for contact with food.  Propylene Glycol, Food Grade, is manufactured from petrochemical raw materials, and does not contain compounds of animal or vegetable origin. This USP compliant grade of material is also used as a food additive. 

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