All the major electronic/microelectronic adhesive suppliers have
screenable Ag epoxies you could sort of use for this, but I would be a
bit sniffy about it.
Its been done before, but personally I would not recommend it except
as a short term/prototyping type fix. Not really good for a long term
high reliability assembly, probing on to Ag epoxy is not necessarily
going to produce a consistent result either. Does your customer have
prior experience on this assembly showing results are good enough for
the intended application?

Mike

----- Original Message -----
From: "Hans Rohr" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, July 26, 2000 2:10 AM
Subject: [TN] Plugging Vias With Conductive Epoxy


> 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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