With the phase-out of HCFCs being accelerated in some regions of the World, most notably Europe, many studies have been performed on two alternatives to replace R22 i.e. R407C and R410A. However there is a third alternative emerging as a candidate to replace R22, namely R417A comprising R125, R134a and R600.
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http://www.eurocooling.com/articlerhodia.htmmvh humlan.