General specification for flexible PCB in CojoinLayer Count1-6 layersBoard thickness0.05-0.80mmLaminate typePolyimide, Polyestercopper thickness18-70umMin drill size0.15mm(6mil)Max panel size508*610mmMin trace width/spacing3/3mil(0.075/0.075mm) Surface treatmentOSP, ENIG, Immersion tin, Electrolytic gold, Gold fingers