Heat Exchanger Copper Tubes Application: Mainly used for Air Conditioning and Refrigeration, Heat Exchange . 1.Heat Exchanger Copper Tubes2.Application: Mainly used for Air Conditioning and Refrigeration, Heat Exchange.3.Standard: ASTM B280, ASTM B68, ASTM B75 standard, EN 12735 standard, AS 1571 standard and JIS H3300 standard.4.Temper: SOFT OR HARD