Anthony,

I confess to not understanding what you mean by "board extractor hardware"?
Could you elaborate please.

If by this you refer to some form of heat removal/exhaust, from the area
around the assembly, then I cant see why this would pose any problem unless
the coating material has not fully cured, or that the chosen material may
outgass undesirable elements that could find their way onto part surfaces,
that should be kept clean.

As an example of this, I know of 1 Auto manufacturer, who experienced field
failures because the coating was "thought" (not necessarily proven) to have
outgassed some element onto an adjacent open relay that was used to signal
the driver that the trafficator was working. The assembly was located in the
dashboard under the windshield where it got real hot to around 90-100
degrees C!

Hope this helps, or you can enlighten me further as to your precise problem.

Regards, Graham Naisbitt
__________________________________________________________________________

[log in to unmask]

Concoat Ltd
Alasan House, Albany Park
Camberley GU15 2PL UK                        http://www.concoat.co.uk

-----Original Message-----
From: Anthony Bundrant <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 29 April 1998 23:38
Subject: [TN] Conformal Coating Under Extractors


>     Fellow TechNetters,
>
>     A colleague and I have a disagreement and I wanted to defer to a
>     higher authority :)
>
>     Should conformal coating be excluded from the area of the board
>     underneath the board extractor hardware?
>
>     All responses will be appreciated.
>
>     Anthony Bundrant
>     Design Engineer
>     Bell Helicopter Textron
>     (817) 280-8903
>
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