FR-4 PCB board 1.High quality, low cost & fast delivery 2.NO MOQ PCB board 3.Free sample before production 4.RoHs complaints electronic ... 18L, HDI20-28 , HDI MaterialCEM-1,CEM-3,FR-4, High TG FR-4 , Halogen-free FR-4 , aluminium ,Ceramic(96% Alumina) Teflon,PTFE(F4B ... maskbluecopper1ozboard thickness1.6mmfinishingOSPmin trace0.1mmmin space0.1mmcertificateUL, ISO, RoHS FR-4 PCB board