The standards of our products are GB/T1527-2017 "Copper and Copper Alloy Drawn Tubes", GB/T17791-2017 "Seamless Copper and Copper Alloy Tubes for Air Conditioning and Refrigeration Equipment", GB/T18033-2017 "Seamless Copper Water Pipes and Copper Gas Pipes", GB/T20928-2020 "Seamless Copper Tubes with Internal Threads", GB/T 1531-2020 "Los tubos capilares de aleación de cobre y cobre", YS/T 650-2020 "Tubos de cobre sin costura para gases médicos y vacío
