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April 2008

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From:
Bill Dworak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bill Dworak <[log in to unmask]>
Date:
Tue, 29 Apr 2008 11:46:16 -0700
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I would appreciate some input on a subject that I was just hit with today. I am being asked if my customer baked flex boards for 10 hours at 150F would there be any chance of long term reliability issue? The board is what I would call standard issue stack up for a flex board nothing wild polyimide material with a  FR4 Stiffener 4 layers, no fine traces .004/.004. HAL (leaded) surface finish.
 I had an issue several months ago with some rigid boards that where being baked for long periods of time but that was on the assembly side of issues not durability.
Any particular issues that might come from the baking? Any input is welcome.


           Bill Dworak

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