FR-4 PCB board 1.High quality, low cost & ... all lines of PCB, PCB boards, PCB circuit, circuit board,electronic pcb, Copy PCB, design PCB, prototype PCB, PCB fabrication, ... HDI20-28 , HDI MaterialCEM-1,CEM-3,FR-4, High TG FR-4 , Halogen-free FR-4 , aluminium ,Ceramic(96% Alumina) Teflon ... maskbluecopper1ozboard thickness1.6mmfinishingOSPmin trace0.1mmmin space0.1mmcertificateUL, ISO, RoHS FR-4 PCB board