Tolerances on Copper Thickness

The copper thickness of the PCB is a crucial electrical parameter in PCB design. It is important to know that the copper thickness varies due to the manufacturing process. The reasons for this are the base material, whose copper surface has a certain roughness, and the complex manufacturing process in PCB production. The metal lattices of the copper do not build up exactly evenly in the wet-chemical process and a small amount of copper is removed in each cleaning step.

The PCB manufacturer distinguishes between the starting copper thickness of the starting material and the final copper thickness of the finished PCB. In this ThechThursday we explain the correlations and why the PCB manufacturer cannot guarantee the final copper thickness exactly.
https://www.eurocircuits.com/tolerances-on-copper-thickness/

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