I can't find a thread that fully explains why we can accurately claim that the PG we use is not the same thing that's used in Antifreeze.
Is Proplyene Glycol actually stated on bottles of Vanilla flavoring as an ingredient? Is it also stated as an ingredient on Antifreeze bottles? I'm confused.
In order to clear this up, there are 3 chemicals we need to look at. ETHYLENE glycol, PROPYLENE glycol, and DIETHYLENE glycol
First off, you'll notice they are all glycols - a generic name used in chemistry to describe certain alcohols
ETHYLENE glycol is antifreeze. This is the stuff you buy at Walmart and mix with water to protect your engine. It's usually dyed some fluorescent color and is very toxic. If you spill some while working on your vehicle, immediately clean it up as it has sweet taste and might attract animals.
PROPYLENE glycol is used in eliquid (and just about everything else) It is GRAS (geneerally recognized as safe) by the FDA and can be found in a multitude of products, foods, and cosmetics.
DIETYLENE glycol is the chemical that the FDA is concerned about. Ironically, it is used in COOLING systems as it's "antifreeze" properties are very poor, only lowering the freezing temp by a few degrees. It is toxic in humans. This chemical is the one that caused the FDA to be created (look up "Elixir sulfanilamide incident")
I personally feel the FDA (and many others) used the "antifreeze" argument as a scare tactic and sound bite. Compare these statements:
"One sample contained Diethylene Glycol, used in antifreeze..."
"One sample contained Diethylene Glycol, used in curing tobacco..."
or how about:
"..containing nicotine and propylene glycol, which is used in antifreeze."
"..containing nicotine and propylene glycol, which is used in hand sanitizer."