1.Emission Control Systems PCB 2.good quality,reasonable price; 3.quicker delivery; ... )Copper Thickness1/2OZ-3OZ (35um to 105um),+/-8um(tolerance),purity 99.5%Impedance Control±10%Bow and Twist MAX.0 ... 4mm)Pad Tolerance±0.1mm(dia.≥0.6mm)Pad to hole/to pad Tolerance±0.05mm/±0.2mm Solder Mask ... time,+/-2%(tolerance) Certificate SGS,ISO,ROHS,UL, Welcome to visit WALBOND ! Emission Control Systems PCB