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September 2001

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 13 Sep 2001 11:29:55 +0300
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Peter

I don't think that I would use the word "irreversible", rather "mighty
difficult". I fear there is zero compatibility between polymers containg
silicon atoms in their chains and those with only carbon. This would
mean ensuring that all traces of silicones must be eliminated before
filling it with acrylics, remembering that silicones would be
everywhere, including adhering to surfaces. Also you do not wish to a
PCB being sprayed to even touch any such surface. The SAFE way would be
replacement. The CHEAP way, without any guarantee, would be remove all
traces of silicones from EVERYWHERE - and just how would you do that? I
don't know, for a start.

Brian

PL wrote:
>
> Hello,
>
> Could anyone clarify if it is feasible to convert a silicon conformal
> coating area/ booth to an acrylic one?
>
> I was told that once the area is setup for silicon it will become
> "contaminated" and the process is irreversible for other coatings to be
> used. Is this true? If it is could someone provide the technical reason
> behind?
>
> Regards,
> Peter
>
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