... Al plate punching, Surface cleaning, Bounding, Weld the suction, Tube assembly, Leakage test, Drying, Surface cleaning, Coating, Inspection, ... (7500 sets per day) R134a Cooling System Tube Inside standardsResidual moisture≤20mg/m2Residual impurity≤30mg/m2Residual ... Specification of coatingCoating thicknessThickness of flat plate or tube powder painting: 30 100umHardness of coating≥2HImpact ...