Main material: 1. Al pipe(O.D.8--10)*(t0.7-t1.0)(tube inner smooth or inner grooved) 2.Copper pipe: (O.D.6--9.52)*(t0.35-0.5)(tube inner smooth or inner grooved). 3. Steel pipe: (O.D.6--8)*(0.7 4.Fin: Al-foil thickness 0.13-0.25. Sturcture 1. draw-expanded type 2. insert type 3. side imbedded type(or water-expansion type) 4. mahince-expanded type 5. Spiral-finned type Performance 1. surface anodic oxidization or dip coating to prevent the corrosion 2. inner cleanness can meet the requirement of CFC & R134Acooling system. 3. Satisfythe cooling capacity reqyirements. .