Most of the FC's are highly toxic when exposed to fire.
R-1234yf is not only (slightly) flammable but also releases hydrogen fluoride and carbonyl fluoride when exposed to fire, but this is what is in almost all new cars.
I've run a propane/butane mix in an R12 car before and the fact that it was flammable didn't bother me a bit. The 14 gallons of gas would worry me more than 12oz of propane going up.
> Kinda how we don't use toxic ammonia as a refrigerant.
Ammonia is definitely still used as a refrigerant, just not in consumer equipment. Itβs commonly used for ice rink chillers, at least in the US and Canada. Not sure about Europe.
For what it's worth, my mini fridge and my chest freezer use some hydrocarbon refrigerant. They're littered with warning signs not to puncture them.