... , flex PCB, flex circuit, flex board, FPC board, FPC circuit, FPC assembly, we are professional FPC factory. 1. Layers: 1-8 layers 2. Material ... thinkness: -Single sided: 0.07mm -Double sided: 0.12mm -4 layers: 0.38mm 7. Copper thinkness: 12µ M, 18µ M, 35 ... µ M 8. Stiffer: FR4, PI, PET 9. Surface Finishing: Ni/Au Plating ...