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R-23 is an azeotropic HFC refrigerant gas with zero ozone layer depletion used in new equipment that works at very low temperatures (around -60 to -100 °C). It is also an indirect replacement (retrofit) for R-13 and R-503. 

R-23 is only used in cascade systems, at evaporation temperatures of between -60 and -100 °C and condensation temperatures of between -10 and -40 °C. Its thermodynamic properties are very similar to R-13.


· Industrial refrigeration plants (e.g. gas separation and chemical processing).

· Pharmaceutical production plants.

· For medicinal purposes (e.g. blood banks).

· Material testing.

· Cryomats and cryostats.

· High vacuum.

To use the same refrigerant load with R-23 as with R-13 and R-503 requires a larger expansion tank. For this reason it is recommendable to load R-23 initially using the same static pressure as for R-13 and R-503. The ideal load would be approximately 10-20% less in weight than that of R-13 and R-503.


  • Low Temperatures
  • new Installations
  • Retrofit


· Dos not damage the ozone layer, ODP = 0.

· Only compatible with POE synthetic oils.

· Equipment can be refilled in the case of leakage.

· Cooling capacity higher than R-13 and lower than R-503.

· Energy efficiency very similar to R-13 and lower than R-503 (10%).

· Suction pressure less than R-503 and similar to R-13.

· Global warming potential (GWP) = 14,800

· Boiling point at 1.013 bar (ºC): -82

· Temperature slip or glide (ºC): 0

· Saturated vapour density at 25ºC (kg/m3): 370.37

· UN nº: 1984

· Safety classification: A1. Low toxicity and nonflammable.                


  • 11 Kg
  • 57 Kg


  • Synthetic POE oils

·The reason why R-23 has a lower cooling capacity than R-503 is due to the increase in suction pressure and to the molecular weight of R-503 as opposed to R-23.

· For the design of a new piece of equipment or for a retrofit, it must be remembered that the compression ratio of R-23 is higher than that of R-13 and R-508.

· It may be necessary to adjust the expansion valve in a retrofit of R-503 to R-23 due to the high vapour pressure levels of R-503. It is not necessary for the retrofit of R-13. Why do we load R-23 using static pressure? As R-23 has less saturated vapour density than R-503 and R-13, the restructuring (retrofits) with R-23 might give rise to higher static pressures. Should the unit heat up to ambient temperature if the system were to shut down, it may lead to having liquid present at higher temperatures than R-13 and R-503, with the same load of refrigerant. Given that the vapour pressure of the liquid increases more quickly with temperature than through the pressure applied by the expansion of the gas, the static pressure of R-23 is higher than that of R-13 and R-503 given the same load and system volume.