My apologies to everyone who has asked me for a copy of the study our
manufacturingdepartment did on the Humiseal conformal coatings!  I got
several requests for this study a couple of weeks ago & went in search of a
copy of the evaluation results.  Much to my dismay I found that no report
was ever issued.  And no one remembers the specific results except when they
thinned too much, the coating ran under the components without depositing a
thick enough film.  The study specifically addressed brush coating or flow
coating under components.   The work instruction was revised to reflect a
maximum thinning ratio of 10% by volume.  Also, a thickness gauge was
purchased for use in ensuring that the average conformal coating on the
boards is maintained at 3 +/-  0.5 mils.  So much for documentation, I
guess.  Again, my apologies!!

Sheila Smith, Tracor Aerospace

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