Quote:
Originally Posted by jeff5may
I believe the r12 / r134a substituters were using about 70 percent butane and 30 percent propane to achieve the same vapor pressure in the system. As usual, a txv works better than a fixed orifice, but is less tolerant of being undercharged.
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According to the MSDS sheets I have read, R12A (the drop in R12 substitute) as well as Envirosafe R134A replacement are made out of 60% propane and 40% butane.