... related to HFC(Hydrofluorocarbon) group, so it's harmless to the ozone layer. R-404A is a near-azeotropic mixture of ... (1,1,1-trifluoroethane).R-404A is formulated to closely match the properties of R-502, making it useful for a variety ... to retrofit many existing R-502 systems. The physical and thermodynamic properties of the blend cause it to behave much like R ...