2L FPC replace coverlay with red solder mask.

For FPC design, coverlay is more common than solder mask. But this design, it replaced coverlay with red solder mask. 2L FPC, 1OZ Copper thickness, 1mil adhesive PI. Red sold mask replaced the coveraly. White silkscreen. Board thickness: 0.14mm+/-0.03mm. Minimum hole copper thickness 25um. Add PI stiffener at the gold finger area, meet the final thickness to be 0.3mm. Stick 3M 467 at the back side of FPC. If you have any demand, pls don’t hesitate to contact us!