Heat Exchanger Copper Tubes Application: Mainly used for Air Conditioning and Refrigeration, Heat Exchange . Heat Exchanger Copper Tubes1.Application: Mainly used for Air Conditioning and Refrigeration, Heat Exchange.2.Standard: ASTM B280, ASTM B68, ASTM B75 standard, EN 12735 standard, AS 1571 standard and JIS H3300 standard.3.Temper: Soft OR Hard Heat Exchanger Copper Tubes