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See Chinese contents: GB/T 17791-2017 GB/T 17791-2017: Seamless copper and copper alloys tube for air conditioner and refrigeration equipment
This standard specifies the requirements, test methods, inspection rules, packaging, marking, transportation, storage, quality certificates and purchase orders (or contracts) of seamless copper and copper alloys tube for air conditioner and refrigeration equipment. This standard applies to seamless copper and copper alloys tube for household air conditioners, refrigerators (freezers), small and medium-sized central air conditioners, refrigeration equipment.
