R503 AND R13 REPLACEMENT AIRCOND GAS

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.

General Information.
R508B is an HFC/PFC (Perfluorocarbon) blend designed to be a replacement for R503 or R13 in very-low-temperature refrigeration systems, typically the low stage of a multi-stage system. R508B has properties similar to R503 and can be used to replace either R13 or R503 in an existing system.