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February 2004

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Subject:
From:
Mike McMonagle <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 23 Feb 2004 12:19:27 -0600
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text/plain
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Mark,
        I would tend to agree with your customer rather then your CC
vendor. RTV staking on top of CC seems like it would be pretty
ineffective at doing what it is intended to do. We build hi-rel boards
for customers that manufacture downhole drilling tools for oil
exploration, RTV and epoxy staking of components is always performed
before CC....

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mark Charlton
Sent: Monday, February 23, 2004 12:09 PM
To: [log in to unmask]
Subject: [TN] Conformal coat over RTV?


My learned and esteemed colleagues,

One of our customers has requested that we conformal coat over a DOW
3145 RTV adhesive used to stake some sensitive components.  The
specified coating material is MS470-N, a urethane product.

Is this a standard practice (to coat over RTV)?  We have always
conformal coated the PCA and then staked the components using the RTV.
Our CC vendor isn't too pleased with this request.

Mark Charlton

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