... 4 single side 1 layer pcb bare board. 2.Meet ROHS, UL, SGS. ISO9001:2000. pcb PRODUCTION CAPABILITYLayers: 1-20 layersMaterial: FR-4 ... PunchingWarp & Twist0.70%Insulation Resistance10Kohm-20MohmConductivity<50ohmTest Voltage10-300VLayer-layer misregistration4 layers: 0.15mm(6mil) max6 layers: 0 ... We can provide single-sided,double-sided ,multi-layer,high frequency,MCPCB,metal-backed PCB,welcome your ...