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July 2000

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Subject:
Re: Plugging Vias With Conductive Epoxy
From:
mike connolly <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 28 Jul 2000 19:04:09 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (68 lines) 
What is the purpose of the plug?  What are you trying
to achieve?  Does the customer require a flat service
verse a surface with a hole in the middle?  What is
the requirement for the surface that the test pin will
come in contact with?  Is gold acceptable?

Mike
--- Hans Rohr <[log in to unmask]> wrote:
> 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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