Isobutane (R600a) has been extensively utilized in residential refrigerators in various countries throughout the globe since the 1990s, when the NGO Greenpeace debuted their GreenFreeze idea, with a maximum charge of 150g (5.3oz). The Environmental Protection Agency (EPA) did not raise the change limit for R600a in home refrigerators from 57g (2oz) to 150g until…
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