Check the listing for details. Food Grade Propylene Glycol 99.9+% Purity. Condition: New. Listed at 20.49 USD. Propylene GlycolFood Grade / USPby Duda Energy Propylene glycol is a viscous, oily fluid which is commonly used in many products. Food grade propylene is safe for drinking and is non-toxic. It is often used as a food preservative, a non-toxic antifreeze, part of a mixture with glycerin to make e-juice, a humectant (to keep foods moist), solvent (ink jet printer cleaning), and in food refrigerant applications, such as in making icecream. For antifreeze applications, we recommend using no more than a 60% by weight solution in distilled water. Water has a high specific heat capacity, so only the appropriate percentage should be use to prevent freezing and boiling. Excessive use of propylene glycol will cause the antifreeze to lose its ability to retain sudden increases in heat and often cause system failure, especially in vehicles. (This is the same rule for ethylene glycol as all) Use the following table as a guide for your antifreeze application. Note: We recommend using our inhibited propylene glycol is the antifreeze system has metal parts. The special inhibitors added to the glycol coat the metals and protect them from corrosion if the antifreeze solution becomes acidic over time. Solution (% by mass)102030405060Freeze Temp (º F)26187-8-29-55Boiling Temp (º F)212213216219222225