... the Rigid Flex pcb circuit board: 1.PI+FR4,1.6mm,H/H,Lead Free 2.17 years experience in FPC,since 1994 Flex-Rigid pcb ... pad pitch 0.5mm (20Mil) Finishes HAL, LHAL, Gold plate, ENIG, OSP, Immersion silver Solder mask colours Green, Red, Blue, Black ... (Automated Optical Inspection) Yes Standards IPC-6013 ISO-9001-2008 Rigid Flex pcb circuit board