This SAE Standard applies to: recycled R-134a refrigerant, used in servicing of motor vehicle air conditioning (A/C) systems that were designed for use 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 refrigerant purity required for the certification of on-site recovery, recycling and recharging machines per SAE 2843 and SAE J 2788.