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November 2012

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From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Fri, 16 Nov 2012 18:52:10 +0000
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A measle is a measle is a measle; unless it propagates, then its delam. Early testing showed no correlation between measling and CAF failures.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, November 16, 2012 11:46 AM
To: [log in to unmask]
Subject: Re: [TN] Laminate, Resin recession-dry glass bundle

Don't forget Conductive Anodic Filament growth (CAF) with this condition
and also crazing. I guess you could have the same problem with measling.

Sincerely,  

 

Paul Reid 

Program Coordinator  

PWB Interconnect Solutions Inc. 
235 Stafford Rd., West, Unit 103 
Nepean, Ontario Canada, K2H 9C1 

613 596 4244 ext. 229  

Skype paul_reid_pwb 
[log in to unmask] 

 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bush, Jeffrey D. (US
SSA)
Sent: November 16, 2012 1:24 PM
To: [log in to unmask]
Subject: Re: [TN] Laminate, Resin recession-dry glass bundle

This is likely poor glass wet-out of the package during lamination -
cores or final lam of the board.  During the laminate cycle, the resin
on the glass fabric enters the liquid state briefly and wets to the
glass fibers in the pre-preg, then cures into the C stage of the resin
system (this is GEL Time).  This allows the resin to become the bonding
agent for the package and cure into the required dielectric layer.  The
fibers become encapsulated in the resin providing good
thermal/mechanical strength as intended.  When this wet out is impacted
by low resin content, gel time, pressure and possibly other rheology
issues, the glass is not bonded into the package.  This will produce a
substrate shows the fibers a lighter than the resins with the weave
properties visible.  Impacts are electro-mechanical performance deltas
in a host of areas, which also vary by extent of the wet out issue.  

Jeffrey Bush
BAE Systems Incorporated 
IS&R - Space Products and Systems
P.O. Box 868, MER24-116A
Nashua, NH 03061-0868
Office +1 603.885.8137
Mobile +1 603.318.8056
Fax +1 603.885.5258

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Friday, November 16, 2012 8:14 AM
To: [log in to unmask]
Subject: [TN] Laminate, Resin recession-dry glass bundle

Fellow TechNetters:

   Can any of the gurus out there comment on the above terminology and
perhaps share a photo.   What is the worse than can occur within the
laminate with such artifacts.

"X"

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