R-407C Explained

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

Physical properties of R407C refrigerant

Property

Value

Formula

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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