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R290 is refrigerant grade propane, a natural, or "not in kind", refrigerant suitable for use in a range of refrigeration and air conditioning applications. The use of R290 is increasing due to its low environmental impact and excellent thermodynamic performance. It is nontoxic with zero ODP(Ozone Depletion Potential) and very low GWP(Global Warming Potential). It is flammable refrigerant and therefor not suitable for retrofitting existing fluorocarbon refrigerant system.