Phil,
It's a bit messy and tricky to work with, but how about something like
Aviation Permatex? It will form in place, cure decently, certainly resist
oils, hydrocarbons and dirt. I would think that it's temperature range
probably about where you need it to be. I'm not sure how it'll affect your
plastic connector flange though.
Bruce Tostevin
Benchmark Electronics
Hudson, New Hampshire
> -----Original Message-----
> From: phil bavaro [SMTP:[log in to unmask]]
> Sent: Monday, April 15, 2002 11:23 AM
> To: [log in to unmask]
> Subject: [TN] Sealant Recommendations?
>
> 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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