Details

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General Information.
R-23 is an azeotropic HFC refrigerant with a zero ozone depletion potential for use in new equipment that works at very low temperatures (around -60 to -100 °C). It is also an indirect substitute (retrofit) for R-13 and R-503. This refrigerant is suited for use in the second stage of a cascade refrigeration system, where at evaporation temperatures between -60 and -100 °C and condensation temperatures between -10 and -40 °C. Its thermodynamic properties are very similar to R-13. The first stage of such a system is often R-448A or R-407F which are replacement refrigerants for R-404A and R-507A (temperature conditioning cabinets, freeze-drying systems.

Features and Benefits
- Great thermal and chemical stability, 
- Low toxicity and Not flammable. 
- Safety classification is A1 group L1.

Applications

- Industrial refrigeration plants (e.g. gas separation and chemical processing).
- Pharmaceutical production plants.
- Medical purposes (e.g. blood banks).
- Material testing.
- Cryomats and cryostats.
- High vacuum

Source: https://gas-servei.com/shop/docs/technical-data-sheet-r-23-gas-servei.pdf