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October 1997

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Subject:
From:
Doug Pauls <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Mon, 20 Oct 1997 10:36:42 -0400
Content-Type:
text/plain
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In addition to what Graham has said about salts under conformal coating,
consider also that when a salt crystal encounters water, which WILL come
through conformal coatings, it will expand up to 200 times its original
volume, creating a localized blister.  This effect is often referred to as
"mealing".  Once the blister is formed, it is a place for water vapor to
collect and condense.  Liquid water together with the original salt material
forms an electrolytic solution, which is generally detrimental to circuit
reliability.

Doug Pauls
CSL

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