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October 2004

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TechNet <[log in to unmask]>
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Date:
Mon, 18 Oct 2004 14:14:10 -0400
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TechNet E-Mail Forum <[log in to unmask]>, "Shoda, Stephen J (US SSA)" <[log in to unmask]>
Subject:
Moisture on PWB and Conformal Coating
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"Shoda, Stephen J (US SSA)" <[log in to unmask]>
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Has anyone experienced poor conformal coat wetting due to moisture on the pwb surface?  Could moisture embedded in the pwb be problematic?  In our process, we batch clean our boards which includes multiple deionized water rinse cycles.  The product is then baked at 250°F for 2 hours.  We have a new solder mask material which coats well prior to our processing. The 2 hour bake at 250°F has always proved adequate. Is anyone using a longer bake time? What is the substantiation for establishing an extended time? 

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