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R-407C is a mixture of hydrofluorocarbons used as a refrigerant. It is a zeotropic blend of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a). Difluoromethane serves to provide the heat capacity, pentafluoroethane decreases flammability, tetrafluoroethane reduces pressure.[1] R-407C cylinders are colored burnt orange.

This refrigerant is intended as a replacement for R-22. R-22 production will be phased out by 2020 as per the Montreal Protocol.[2]

Physical properties[edit]

Physical properties of R407C refrigerant
Property Value
CH2F2 R32 (23%)
CF3CHF2 R125 (25%)
CF3CH2F R134a (52%)
Molecular Weight (kg/kmol) 86.2
Boiling point (°C) −43.8
Saturated liquid density (25°C), kg/m3 1138
Saturated vapour density (25°C), kg/m3 43.8
Critical temperature (°C) 86.4
Critical pressure, bar 46.3
Liquid heat capacity @ 25°C, (kJ/(kg·K)) 1.533
Vapour heat capacity @ 1.013 bar (kJ/(kg·K)) 1.107


  1. ^ A brief history of refrigerant Archived 2011-07-18 at the Wayback Machine
  2. ^ "Unwrapping The Mystery Of R-407C". www.achrnews.com. Retrieved 27 June 2016. CS1 maint: discouraged parameter (link)