===============================
Jim Maguire
Senior Principal Engineer
Boeing Defense & Space Group
(206)657-9063     fax 657-8903
Email:  [log in to unmask]
================================

>----------
>From: 	Chang, Willy
>Sent: 	Friday, March 07, 1997 10:13 AM
>To: 	Maguire, James F
>Subject: 	RE: Conformal coating 
>
>Our experience at Boeing reaffirms that the conformal coating material will
>wick onto pins of unsealed connector.  Nevertheless I would still recommend
>coating metal surfaces especially if it is going to be exposed to humidity
>and salt/fog testing.  Albeit conformal coating is not a hermetic seal but
>our testing shows it does make a noticeable difference. 
>
>We occasionally encounter designs that uses unsealed connectors.  In those
>incidences, we pot/seal the backs of the connector (e.g., polysulfide, etc.)
>prior to coating which prevents wicking very effectively.  Of course the
>"mouth" of the connector is sealed w/liquid maskant and adhesive tape.   We
>have also found wicking is much less of a problem when using spray as oppose
>to immersion application.      
>
>
>
>================
>Willy Chang
>Electronics M&P
>Org. 9-5572
>657-9194
>
>----------
>From: 	Sheila Smith[SMTP:[log in to unmask]]
>Sent: 	Friday, March 07, 1997 5:16 AM
>To: 	[log in to unmask]
>Subject: 	FAB: Conformal coating 
>
>Technetters:
>
>I am soliciting opinions on conformal coating of PBW-mounted connectors.
>Our manufacturing folks refuse to conformal coat within 1/8" of any board
>mount connectors.  They contend the conformal coating will wick up the pins
>and get on the contact areas, regardless of the type of conformal coating
>used or the method of application.  The connectors are not sealed.  These
>boards have to pass salt fog & humidity testing and I don't like the idea of
>having bare areas, especially at the interface where the connector meets the
>board.  Does anyone have any experience with this?  Thanks in advance for
>your help!
>
>S. Smith, Tracor Aerospace Electronics Systems
>
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>
>

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