Refrigerant R406a, Auto Frost

R406A is a non-azeotropic blend of HCFC-22, HCFC-142b, and R-600a used as a "drop-in" or retrofit replacement for R-12 and R-500 refrigerants in medium and low-temperature refrigeration systems. It is commonly used in commercial refrigeration (supermarket display cases), home appliances, and automotive air conditioning (MVAC) systems, often without requiring an oil change.