... QC control PCB Specificationproviding OEM service to all sorts of printed circuit board assembly1Layer1-30 layer2MaterialFR-4,CEM-1,CEM-3 ... spaceing0.075mm(3mil)8Surface finish/treatmentHALS/HALS lead free,Chemical tin,Chemical Gold,Immersion gold Inmersion Silver/Gold,Osp,Gold ... ,ISO9001,ISO14001,ROHS,CQC,SGS15profiling punchingRouting,V-CUT,Beveling printed circuit pcb board distributor