Enviro-safe is selling R600a. More commonly known as iso-butane. Butane, you know, the stuff they put in cigar lighters. Its a hydrocarbon, a fuel, its flammable.
True, it makes a great refrigerant, but the SAE thought it best to avoid using flammable refrigerants, because the refrigeration system cycles through the engine compartment AND the passenger compartment. A leak in either area could be disastrous.
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