Report copyright - NATURAL REFRIGERANTS FOR HEAT PUMPS AND AIR … · IsoButane 20 R600a Fire 1.8-8.5 vol% 600-1000 ppm Butane 20 R600 Fire 1.5-8.5 vol% 800 ppm Propane 20 R290 Fire 2.2-9.5 vol% 2500
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