multi layer pcb circuit board 1.high precision 2.FR-4 base material ... 3.0oz Laminate Materials FR-4,FR-1,,FR-2,CEM-1,CEM-3 Board Cutting Max. number of ... 0.0008” (0.02mm) Aspect ratio 20(5:1) Solder Mask Color green,light green,white,black,dark ... residual thickness ) FR-4(1/3+-0.1mm);FR-1,FR-2,CEM-1,CEM-3(1/2+-0.1mm) V- ... Others UL Cert. YISO Cert.ISO9001TS16949YISO14000Y multilayer pcb circuit board