I need R-12

We were always taught it was the tobacco companies, trying to kill the competition.

Not that hemp aka ditch weed is worth the match.

merrill proclaimed:

Propane is toxic? AFAICT it's no more toxic than good ol' Nitrogen. I'm having trouble finding an MSDS whose toxicology section says it is more than an asphyxiant, or that the liquid can boil on your skin and cause frostbite.

I'd still be wary of using it in an A/C because of the flamability and possibly increased pressures.

Ivan

What sort of pressures do normal freon based A/Cs use? LPG tanks are usually rated for 300 psi, so I suspect that would be the worst that the A/C would need to handle...

Apparently you aren't man enough to apologize for a mis-statement, when the real problem was you don't comprehend what you read.

Spdloader

Static pressures would equal ambient temperatures. Running pressures; 30 psi low side, 200+ on the high side.

LP tanks are of a different construction. Automotive AC piping is quite fragile.

I can see how LPG could work as a refrigerant... The numbers look about right... If the LPG has the odorant added to it, you would quickly know if there was a leak and it was getting into the passenger compartment... It would be noticeable quite a bit before it got into a flammable concentration... Anything less that 2.2% or more than 9.5% is not flammable... All in all, LPG is a relatively safe gas... Hydrogen, on the other hand, is flammable from 4% to 75%... Not really important from an A/C refrigerant standpoint, but important from a standpoint of eventually using it in vehicles as a replacement to gasoline... A lot of the fix-a-flat type devices use propane / LPG as the gas to refill the tires with... Since LPG has such a narrow flammability range, it would be pure luck if you happened to end up with a tire that had a flamable concentration in it...

...or that the cheap mexican buffet was not such a good idea on the cross country trip.

tw