Hello, We are using a PCB with thickness 3.2mm 4 layer and lot of through hole via's of diameter 0.4mm.
We specified our PCB vendor to do plugging.
Now we have big problems, that after 1..4 weeks we measure a low resistance between track's/via's of 20..60kOhm (unstable resistance).
We found out, that the PCB vendor is using his normal solder resist for plugging of via-holes.
Questions: - Is this a standard process for plugging? - Is this okay for such thick PCB's or is it mandatory to use a special plugging paste? - Could the low resistance problem be caused by uncured solder resist in the via hole?
Best regards G�nther
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