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July 2009

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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:
Wed, 22 Jul 2009 08:32:50 -0700
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As much as I dislike OSPs, I agree with Dave. If this is really the case
we would like to see how many others have extreme storage conditions.
This is something we should discuss in IPC-1601 PB (printed board)
storage and handling.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Tuesday, July 14, 2009 12:30 PM
To: [log in to unmask]
Subject: Re: [TN] Storage life for rigid flex

Hi Steve - Wow, if you really are going to sit around for 20 years, I 
would make the pwb surface finish bare copper and apply an OSP treatment

right before assembly. A good tin/lead finish might make 20 years self 
life but you are really on the edge. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




Steve Kelly <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
07/14/2009 02:11 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Steve Kelly <[log in to unmask]>


To
[log in to unmask]
cc

Subject
[TN] Storage life for rigid flex






Good Afternoon,

We have a program for some reasonably simple rigid flex (4-8 layer)
where 
the requirement is a 20 year life in storage conditions from -40C to 
+125C. Is there any evidence that polyimide rigid material and pre-pregs

would be better than a good FR-4 (170C) for long term reliability.
Thanks. 
Steve Kelly



Steve Kelly (PLEASE NOTE NEW E-MAIL ADDRESS)

(416) 750-8433 (work)

(416) 750-0016 (fax)

(416) 577-8433 (cell)




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