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March 2001

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Subject:
From:
Gary Camac <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 21 Mar 2001 10:51:17 -0600
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Pete,

Before you try the Dow "OS-2", let me tell a little story.  This material works by causing the
silicone to expand, to the point where is looses its grip.

I had an engineering prototype of a small sensor assembly that the design guys wanted stripped
of coating for some reason or another.  So, I let the assembly sit submerged in some OS-2 for
5-10 minutes. I then removed the assembly and brushed off the loose coating.  After repeated
the process a couple of times I had removed the vast majority of the visible coating, but
there was still some coating under the components.  I figured I would just let the assembly
sit in the OS-2 overnight.  When I pulled the assembly out the following morning, the silicone
had expanded enough that it popped every SO-8 and SO-14 right off the board.  The silicone had
developed enough force under the parts to pull the legs right out of the solder fillet.

Gary Camac

"" wrote:

> Hi, TechNetters,
>
> I am trying to find a solvent for removing 3M's RTV 738 that has been used
> for bonding components to a number of boards, or to each other. Any
> suggestions?
>
> I have tried 3M themselves and they have no solvent of their own apart from
> "Citrus Base Adhesive Remover" that 'may soften' it enough to peel it off,
> but this seems pretty indefinite.
>
> Thanks in hope
>
> Pete Duncan
> Asst Principal Engineer
> Singapore Technologies Aerospace
>
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