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June 1998

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Subject:
From:
George Franck <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 8 Jun 1998 11:34:14 -0400
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Jim,
We have seen it in GIL-style Polyamide.  There are filler materials that are
put into the "fill" area where the copper was removed.  The process was used
a lot when CIC is used with polyamide base material.  The prepreg flows and
coated the material, and the filler makes the 'filled' area less brittle.

I have only bought boards like this.  Personally never built boards using
it.  Don't know the parameters.  The filler material might be a Ceramic.
May not work in Cyanide.   I can't think of any other disclaimers.  Good
Luck!

George Franck
Raytheon Systems
Falls Church Virginia
"My Opinions are just that."

----------
From: James A Larson <[log in to unmask]>
To: [log in to unmask]
Subject: [TN] Radial Cracks on Cyanide Ester resin
Date: Mon, 8 Jun 1998 15:42:01 +0100

Has anybody experienced Radial Cracking as viewed from a
horizontal section or Fishscale cracking as viewed from a
vertical section using Cyanate Ester Resin.  This resin system
is used to fill a 2 oz. copper plane layer in a 8 and 10 layer board.

If so what parameters have you compensated for to help
minimize this situation?

We've modified  press parameters and drill parameters with
minimal success.

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