AtomTrauner,
I apologize if I sound as if I'm trying to run you down. I'm glad we could help you find a reliable source of R290. As time passes, I hope the HVAC/R industry will come to accept natural refrigerants in general. As of now, there are only a handful of consumer products worldwide that use R290, so there is very little demand for service products.
Good luck with your testing! I hope all goes well. I look forward to hearing back from you with results, especially your findings on common LPG.
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