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July 2009

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Subject:
From:
Syed Ahmad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Syed Ahmad <[log in to unmask]>
Date:
Tue, 14 Jul 2009 17:55:21 -0500
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text/plain
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You need to know activation energy for degradation and then calculate life
at desired temperature.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Kelly
Sent: Tuesday, July 14, 2009 2:11 PM
To: [log in to unmask]
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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