... bending, Al plate punching, Surface cleaning, Bounding, Weld the suction, Tube assembly, Leakage test, Drying, Surface cleaning, Coating, Inspection, ... year (7500 sets per day) R134a Cooling System Tube Inside standardsResidual moisture≤20mg/m2Residual impurity≤30mg/m2Residual ... : 30 100umHardness of coating≥2HImpact of coating50cmkg/cm impact, no crackAdhesion of coating≥two gradeFlexibility of ...