1)Rigid-flexible pcb board. 2 We can produce 1 to 6 layer FPC 3)UL, ISO 9001, ISO 14001,SGS , RoHS 4) ... :4/4milSurface finish:Immerison gold Finished board thickness: 40+/-4mil Application: Hardware Zone Carrier Product process capability1,Layer: 1-302,Board finished thickness:0 ... : HASL/HASL lead free,HAL,Chemical tin,Chemical Gold,Immersion Silver/Gold,OSP, Gold plating.8,Copper thickness:0.5-7.0 oz9 ...