RLX 507 is a long term replacement refrigerant for installations with mid-range and low refrigeration temperatures that previously would have used R-502 or R-22. Its physical, thermodynamic and operational properties are very similar to those of R-502. Discharge temperatures are lower than those of R-502. In some working conditions, the cooling capacity is even higher than that of R-502 but at the same time with a slightly lower coefficient of performance.