sd card pcb 1.UL,ROHS,ISO,SGS,Layer:2-20 ... :3mil Immersion gold circuit pcb, pcba & fpc , multilayer pcb, sd card pcb Our Factory Manufacture Capability ItemManufacture CapabilityMaterialFR-4 / Hi Tg ... mm-4.0mm’(8 mil-160 mil)Board Thickness Tolerance±10%Cooper thickness0.5 OZ-6OZ (18 um-210 um) ... Copper Plating Hole18-40 umImpedance Control±10%Warp &Twist0.50%Peelable0.012"(0.3mm)-0.02’(0 ...