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July 1999

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Subject:
From:
Ed Cosper <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 22 Jul 1999 09:08:19 -0400
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Joe,

What type of Permanganate are you using. Potassium or sodium.  This may make
a big difference. Once works well on higher Tg materials while the other
should basically be used for standard 130 Tg FR4.  I believe the sodium is
better for the high Tg materials.

Ed Cosper
-----Original Message-----
From: Joe Aronson <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, July 21, 1999 5:34 PM
Subject: Re: [TN] Permanganate Problems


Tony,

I know someone who regularly works with permanganate and polyclad.  Ted
Myers at JMSPI.  Hope this helps.


Joe Aronson
Process Eng
JMSPI

>>> Tony Charais <[log in to unmask]> 07/21/99 08:09AM >>>
  We are seeing an occasional problem with our current permanganate process.
We have a DOE running but we are having problems developing topography in
the hole on a given product. This is a high aspect ratio multilayer board.
We are confident that the problem isn't related to fluid transfer in the
hole. This product is based on a PolyClad core. Has anyone else had problems
with PolyClad material? We are wondering if it could be something to do with
their resin. Any support from the technet would be appreciated.

Tony Charais
Manufacturing Engineer
[log in to unmask]

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