6-layer immersion gold E-paper main board pcb 1)Base material:FR-4 2)Surface ... )Certificate:UL,ROHS,REACH,IS 6-layer immersion gold E-paper main board pcb1)Base material:FR-42)Surface Finish :HAL3 ... )Certificate:UL,ROHS,REACH,ISO9001,T/S169494)board thickness:1.6mm5)Min hole size:0.3 ... ,NOT LEAD FREELEGEND COLORWHITE, BLACK, YELLOW,GREENCERTIFICATEUL,ROHS,REACH,ISO9001,T/S16949