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Subject:	Re: Conformal coat over RTV?
From:	David Douthit <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 26 Feb 2004 08:56:54 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (53 lines)

Mark,

DON'T!!!

The fact that the components are "sensitive" combined with the fact that
the coating will not bond properly results in an environmental exposure.

Why RTV staking, cost? Use epoxy!

Trying to save money no matter how much it costs is very expensive!

David A. Douthit
Manager
LoCan LLC

Mark Charlton wrote:

>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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