TECHNET Archives

March 1999

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Jeff Hempton <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Mar 1999 14:54:50 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (77 lines)
     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

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text
in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for
additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700
ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2