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July 2001

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Subject:
From:
Hans Hinners <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 18 Jul 2001 10:53:47 -0700
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Kathy,

Is the white residue in the coating or on the assemblies surface?

It's probably moisture related as has been discussed recently.

Do you dry the assemblies prior to coating?

Hans

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Process Engineer
Toppan Electronics, Inc.
770 Miramar Road
San Diego, CA 92126
(858) 695 - 2222 ext. 241
(858) 695 - 6823 fax
[log in to unmask]


-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Wednesday, July 18, 2001 10:24 AM
To: [log in to unmask]
Subject: [TN] White residue from conformal coating


What causes white residues after conformal coating?  The coating is an
acrylic and after the first coat there appears to be a white residue and
after the 24 hour cure the coating appears very dull and still has some of
the white residues.  The residues almost look like water flux residue but it
isn't.  The supplier that the coating was purchased from says it is strictly
humidity related and only a cosmetic issue.  There is no visible loss of
adhesion.  The solder mask is a LPI matte finish.  Can this be part of the
problem?

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