Stefan,
By chance do you happen to know what process the board MFGs use to
remove the excess copper? (as in etching boards the way we do to leave
only the traces)
I am guessing it is a chemical etching of some sort, but have no idea
beyond a guess.
Chris
> it makes no sense to coat the PCBs with something that prevents
coating
> with resist, intentionally or by accident.
> The manufacturer could not sell the material so he can not produce
it.
> If it was coated with some "mystery material" it must have been by
> accident later on, or maybe a silly person "preventing corrosion".
>
> In PCB houses the boards are cleaned by motorised scrubbers and
water
> only, usually, i'm told.
>
> ST
>