8-layer E-book pcb 1)Base material:FR-4 2)Surface:immersion gold 3)Certificate:UL,ROHS,REACH,ISO9001, 1)8-layer ... MULTILAYER)IMPENDENCE TOLERANCE±7%PIH TOLERANCED>5.0 ±0.076mm0.30 ±0.05mmD≤0.3 ±0.08mmMIN. FINISHED HOLE SIZE0.2mmHOLE COPPER ... ≥20umMIN. TRACK WIDTH0.075mmMIN. TRACK SPACING0.075mmPROFILE SIZE TOLERANCE±0.1mmPROFILEMILLING MOULDING V-CUT CHANFERCOATINGHAL, LEAD FREE HAL, ENIG/ ...