insulation copper tubes for air conditioner Size: 1/4", 3/8", 1/2", 5/8", 3/ ... , chemical engineering, air condition, refrigerator, etc.Standard Complied: ASTM B-280, EN-12735, JISH-3300, GB/T-17791(copper tube) Insulated Material: PE ... Character: Anti-UV, good heat resistance, low water absorption Copper thickness compatible any gases ...