Re: Dissolve epoxy glass but not copper?

<[EMAIL PROTECTED]> wrote in message
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>
> Hi!
> Is there any chemical substance capable of completely dissolving
> epoxy glass, 1.6 mm thick, but not dissolving at all the 35 uM
> copper that coats it? (it's a photoetched printed circuit board)
>
> I'm trying to find a cheap way for making stencils.
>
> Thanks!
> Antony
>
I believe the chemical that is used in the PCB biz to disolve fiberglass/FR4
is called Permanganate....A nasty dark purple chemistry. They use it to
clean out drilled holes before the electroless copper process. I don't think
you would want to go here but ....what the heck...that's how it's
done.....Ross