Panel Copper Plating → PTH
(Plated Through Hole)
The step follows drilling hole is copper plating.
Except those drilling holes for tooling purpose, the rest of the drilling-hole wall will be plated with copper as for the purpose of connection of trace in different layers or for those DIP components.
By blocking the holes and areas with no needs of copper, copper plating is applied not only on the drilling-hole wall but also on the whole PCB.
For requirement of finished 70um, normally PCB vendor takes 35um material and do copper plating to be 70um.
Except those drilling holes for tooling purpose, the rest of the drilling-hole wall will be plated with copper as for the purpose of connection of trace in different layers or for those DIP components.
By blocking the holes and areas with no needs of copper, copper plating is applied not only on the drilling-hole wall but also on the whole PCB.
For requirement of finished 70um, normally PCB vendor takes 35um material and do copper plating to be 70um.