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I use a mix of propane and isobutane for a r12 system. It's also compatible with 134a. Volume differs though due to weight. So you'll have to do a conversion. I put a can in every year and I'm happy.
Flammability is on par with r12 without that fluorine to cause cancer (in the state of California).
I would agree with James on the bomb thing. There's no rapid expansion and under pressure it'll quickly vent or be a short lived propane flame thrower. But that's very unlikely as it's in the gas phase. Gasoline vapor is way more dangerous.
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