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Subject:	Sealant Recommendations?
From:	phil bavaro <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Mon, 15 Apr 2002 08:22:46 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (36 lines)

Ok, I've been around the sealant, conformal coating, potting, and general
adhesive world for 20 years and I have my own opinions and preferences when
it comes to specifying a compound for a production assembly, but I would
like to see what this group will suggest for this new assembly we are
designing:

We have a CCA on which is mounted a very large bulkhead type connector
which requires a form in place sealant around it where it interfaces with
(sticks through) the chassis.  The connector is mechanically fastened to
the chassis with four screws but the application will see very tough
vibration exposure.  The bond is between  the connector flange (plastic)
and the chassis (cast aluminum) and must be capable of resisting constant
outdoor environment abuse such as high pressure water spray cleaning, motor
oils, fuels, and general dirt.

The temp range is -40 C to +85 C, and it will not be submerged (at least
not intentionally) for long periods of time but moisture is the primary
culprit that we are trying to defeat as the CCA will not be sealed with
conformal coating.

Please select your choice and tell me why?  Remember, this is for
production so cure time, cost, and application ease are very important
factors.  Please include whether or not the cast aluminum chassis  needs to
be chem filmed, primed, or painted to seal its surface.

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