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May 2008

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Fri, 23 May 2008 16:32:51 -0400
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We are using Chemtronics Konform AR on some circuit boards.  The boards are batch washed in DI water and pre-baked prior to coating and then cured in a 60° or 77° C oven.

In a recent test of a new washing system where we are removing slip ring dust (brass and carbon) on these boards and dielectric oil from other boards and aluminum castings, I noticed the conformal coating peeling off in sheets after both the wash and DI rinse cycles.  Both wash and rinse are between 140 and 150° F.

Is this stuff peeling off because of the water temperature, poor pre-coating prep or possibly something else?

Thanks in advance,

Phil

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