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Old 11-10-21, 08:44 PM   #6
BradC
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Join Date: Dec 2010
Location: Western Australia
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Please don't use straight Propane in an R12 system. The appropriate blend to replace R12 is about 40% R660a (iso-butane) and 60% R290 (propane).

In this chart OZ-12 is the 40/60 blend. Watch the pressures. Because I like a perverse mix of country units, Y axis is pressure in PSI and X axis is temperature in degrees Centigrade.



Not butane. Iso-butane.
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