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May 1998

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Subject:
Re: Copper Plugging Vias
From:
Alex Neussendorfer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 15 May 1998 07:51:13 -0500
Content-Type:
text/plain
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text/plain (60 lines) 
A word of caution:  Holes will normally plate shut closer to the surfaces,
leaving a barrel shaped hole with trapped plating solution.



----------
> From: [log in to unmask]
> To: [log in to unmask]
> Subject: [TN] Copper Plugging Vias
> Date: Tuesday, May 12, 1998 3:47 PM
>
>      Address,
>
>      How many suppliers are copper plugging .008 finish vias, provided
the
>      surface finish is OSP.  Provide your answer(s) on finished board
>      thicknesses of .062 and .028, std tolerances.  If so, what
percentage,
>      nominal, are you able to plug shut.  Through cross-sectioning do you
>      have the following conditions.
>
>      From my past experience the plugging of vias is not feasible using
an
>      electroless and electrolytic plating combination process.
>      Cross-sectioning would later show a dog-bone effect.  Does this
still
>      hold true today.
>
>      Thanks,
>
>      John Gulley
>
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