... to R134a & CFC Specifications Raw materialCopper steel tube φ9.52Wall thicknessinner smooth or inner grooved T ... bending ,Punching the fins,Tube expanding,Degreasing,Welding and assembling,Leakage test,Drying,Inspection,PackingTechnical standardsSpecificatonHoles distanceExpansion ... for refrigeratorCapacity500 thousand sets per yearCooling System Tube Inside Standards Pipeline volume,cm3≤100101~200201 ...