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June 2006

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Subject:
From:
Jeffrey Bush <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jeffrey Bush <[log in to unmask]>
Date:
Thu, 15 Jun 2006 08:20:34 -0400
Content-Type:
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We have not seen a difference.  From a materials perspective a single
ply opening offer less CTE mismatch and stress which should yield less
of a contribution to warpage.  Certainly the "square" weave plies offer
the best stress management.  The real factors in warp are resin content
differential above of below the centerline with copper differences a
second.  I would think the glass styles are getting into the PPM ranges
for contributions to bow. 

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerald Gagnon
Sent: Wednesday, June 14, 2006 9:54 PM
To: [log in to unmask]
Subject: [TN] Warpage in single ply vs multi-ply multilayer stackups

Hi All,

I should probably know the answer to this, but thought I'd pose the
question
and get alternative theories and points of view.

Is anyone finding a difference in the level of PWB warpage between
multilayer constructions made of multi-plies versus single-ply?

Assume in both cases that the supplier, processing, and materials are
identical.

Best Regards,

Gerry

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