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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 11 Mar 1999 14:54:50 -0500 |
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Hey group....along this same thread, we have a surface mount coil that
is suspended in a plastic package design....and sometimes the coil
breaks loose from the package. Our first thought is, of course, to
squirt a heapin' helpin' of RTV (not really RTV, a product somewhat
like RTV "of a grade that doesn't liberate acetic acid on cure"
heh-heh) underneath the coil to support/suspend/damp the part from
shock. A question the coil manufacturer has, is will the TCE mismatch
(or any other issue like curing of the RTV) potentially cause the coil
wire to break?? My experience says "NO", but anybody out there have a
bad experience with this???
Appreciate any responses, thanx!
Jeff Hempton
United Technologies Electronic Controls
PS...
Don't squeeze RTV from the middle of the tube
(an RTV mfg'er svc announcement)
______________________________ Forward Header __________________________________
Subject: Re: [TN] RTV for SMT components
Author: Eric Christison <[log in to unmask]> at Internet
Date: 3/11/1999 9:57 AM
> I have a board which has failed shock and vibe testing, due to a SMT
> component breaking off. I have been told to use an RTV to hold the part
> on.
> Could I please get some help. What is an RTV? Who do I get them from? Is
> there automated ways of applying? I would be more than happy to hear from
> vendors, but maybe they should respond directly to me.
> Thanks.
>
> Steve Quinn
>
Steve,
RTV is a silcon sealant - like the stuff you put round the edge of your bath to
stop it leaking. RTV is Dow Corning's trade name for it's family of sealants.
If you really want to use this to stop the device leaving the board, make sure
you get hold of a grade that doesn't liberate acetic acid on cure. Normally
it'll tell you on the side of the tube and if it does it'll smell of vinegar.
You can probably tell that I wouldn't rate this as a solution to your problem -
but good luck anyway!
Eric Christison
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