... .05mm/±0.2mm Solder Mask Pad no Open soldermask must cover all on both side, reject tin on pad Pad Open ... Solder Mask Thickness0.7mil,raised H≤0.05Colour green,blue,red,yellow,black,white(LPI/MATT.,UL 94 V0 approved) Surface Finish ... % pass for the first time,+/-2%(tolerance) Certificate SGS,ISO,ROHS,UL, Welcome to visit WALBOND ! 4L PCB with BGA and gold finger ...