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Date: | Thu, 15 Jun 2006 08:20:34 -0400 |
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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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