One of our customers wants us to plug vias (.016-.020") with a
conductive epoxy material.  The board is finished with white tin so
plugging with solder is out. The vias do not have to be completely
filled but the plugs must be strong enough to withstand test probe
pressure.  The epoxy filled vias will be used as test points.  We have
used carbon and silver epoxy on conductive surfaces but never to plug
holes.  Has anyone ever done this and can you suggest a conductive epoxy
that can be screened on?

Hans Rohr

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