Inhibited Propylene Glycol

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Usually mentioned in conjunction with antifreeze, inhibited propylene glycol in its natural state has barely any noticeable taste, smell, or color. Usually a dye is added for easy identification, which why antifreeze commonly appears to be pink or blue. This type of glycol is not the only chemical used to make antifreeze, but is considered much safer than others, such as ethylene glycol. Even the Food and Drug Administration (FDA) recognizes that it is non-toxic enough to be used in certain consumable and household products.

A proper antifreeze solution must be able to withstand extreme temperatures at which water would boil or freeze. It functions as cold as -29C or as hot 122C, which translates to -20F to 250F.

Antifreeze solutions became very useful where plain water falls short. For example, a car engine, which gets extremely hot, must be cooled. A system of water-filled pipes would be the perfect solution, except that water freezes rather easily. Even relatively moderate climates dip below 32F occasionally. When water freezes, it expands, which would bust the pipes. However, it is mixed with water has a much lower freezing point, and therefore is perfect to use as an automotive coolant.

If propylene glycol comes in contact with heat or air, it forms lactic acid which can be very corrosive to these metals. Ph buffering agents are added to the propylene glycol in order to keep it from being too corrosive. Especially when used as a heat transfer fluid, it must be inhibited in order to prevent corrosion in metals such as steel, copper, iron, and aluminum. These metals are commonly used in boilers and chillers, and frequently work together with antifreeze solutions like inhibited propylene glycol.

Other uses for it include brake fluid, or other hydraulic fluids. Additionally, if you look around your kitchen and read some of the ingredients for cake mixes, soda, food coloring, fat-free dairy products, or popcorn, do not be surprised to see this type of glycol listed. It protects certain foods from freezing, acts as a binding agent, and also assists as a preservative. Some baby wipes, antiperspirant deodorants, lotions, and lipsticks might also contain inhibited propylene glycol, as well as soaps, room deodorizing sprays and all-purpose cleaners.

Of course this does not mean that it should be consumed, whether in its concentrated form or when diluted with water in an anti-freeze solution. Proper safety measures should be taken to keep the inhibited propylene glycol away from curious children or pets, and if consumed, medical attention should be sought immediately.

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Click on the links provided for more information on Calcium Chloride, inhibited propylene glycol and coolants.



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