R-407C
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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. 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.
Physical properties
| Property | Value | ||||||
|---|---|---|---|---|---|---|---|
| Formula |
|
||||||
| 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 |