6-layer immersion gold E-paper main board pcb 1)Base material:FR-4 2) ... : HAL 3)Certificate:UL,ROHS,REACH,IS 6-layer immersion gold E-paper main board pcb1)Base material:FR-42)Surface Finish ... .1mmPROFILEMILLING MOULDING V-CUT CHANFERCOATINGHAL, LEAD FREE HAL, ENIG/IMMERSION GOLD, OSPSOLDER MASK COLORGREEN, BLUE, BLACK, WHITE,REDTECHNNOLOGYBLOCK,BGA,PEELABLE,CARBON ...