This SAE Standard applies to: recycled R-134a refrigerant, used in servicing of motor vehicle air conditioning (A/C) systems that were designed for used with R-12 and have been retrofitted for use with R-134a; recycled R-134a refrigerant, used in servicing of motor vehicle air conditioning (AC) systems that were designed for use with R-134a; recycled R-1234yf refrigerant, used in servicing of motor vehicle air conditioning (A/C) systems that were designed for use with R-1234yf. Hermetically sealed, refrigerated cargo systems are not covered by this document. The purpose of this SAE Standard is to establish the minimum level of purity required for on-site recycled R-134a and R-1234yf removed from, and inteded for reuse in, mobile air-conditioning (MAC) systems.