We have always used this formula.
     No more than a 4" stack of boards
     150 F for 4 hrs.


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Subject: PCB Pre Bake
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Date:    9/7/95 6:33 PM


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Date: Fri, 8 Sep 1995 09:49:58 +0930 (CST) 
From: ian graham <[log in to unmask]> 
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Subject: PCB Pre Bake
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What time/temperature profile is suitable for FR4 and FR5 prebaking prior 
to assembly?
     
Process is print, place and reflow.
     
--------
     
Ian Graham [log in to unmask]