... company's process capacity for your reference, for more messages, pls contact with us freely!ItemSpecification MaterialFR-4 / Hi-Tg FR-4 / Lead free Materials ... 7mil,raised H≤0.05Colour green,blue,red,yellow,black,white(LPI/MATT.,UL 94 V0 approved) Surface Finish HALtin ... % pass for the first time,+/-2%(tolerance) Certificate SGS,ISO,ROHS,UL, Welcome to visit WALBOND ! 4 Layer PCB with buried&blind ...