It took a little searching, but i found that HR12 is similar - if not exactly the same - as Duracool. Fact is HR12 is a blend of propane and isobutane. The Hychill web page doesn't come out and say that for some reason. I've heard wonderful things about this refrigerant. Next time I need to convert an r12 system I'll be trying it. One caveat with this refrigerant is that should you have a leak in the system, the propane and butane don't leak out at the same rate.

For the people who want to point out the fire and explosion hazard of HR12, just remind them of the 13 to 20 gallons of volatile and explosive gasoline they carry around in their gas tank, some of it already mixed with oxygen!

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95 E320 Cabriolet, 169K