... (tolerance),purity 99.5%Impedance Control±10%Bow and Twist MAX.0.75%(SMT)Anti-strip 0.88N/mmResistance≤20ΩReactance 500V ... /to pad Tolerance±0.05mm/±0.2mm Solder Mask Pad no Open soldermask must cover all on both side, reject tin ... % pass for the first time,+/-2%(tolerance) Certificate SGS,ISO,ROHS,UL, Welcome to visit WALBOND ! 4L PCB with BGA and gold finger ...