The R12 charge for my "new Mercedes" is 42 lbs. Thus, I have "skin in
this game" because the system is currently empty and purged, needing
refill.
This system sounds like it needs thorough testing before you
subject the world to a potential leak of that magnitude! :-)
I believe a decade or so is a long enough test. That quantity
would be not so easy to come up with, probably a commercial
HC refrigerant source would be more practical, you could get
it in those BBQ-tank sized containers.
I think the R290/R600a combination works pretty well.
-- Jim
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