Jerry

It seems I may have missed the original posting - probably hit the Delete
key too soon.

You make an interesting comment in respect to plasma etching and then
encapsulate with an RTV.

If you check out the recent postings from Brian Ellis (hello Brian) and Alan
Brewin, they point out that silicones are not good moisture barriers.

Your procedure seems extreme whereas I feel sure a conventional coating will
do the job. Why do you have concerns about coatings for high voltage
circuits?

As for new technology, maybe you would like to consider solventless or
latest water based coatings? If you would like more info, please ask off
line.

Regards,
Graham Naisbitt

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WEB: http://www.concoat.co.uk

CONCOAT Ltd
Alasan House, Albany Park
CAMBERLEY GU15 2PL UK

Tel: +44 (0) 1276 691100  Fax: +44 (0) 1276 691227
----- Original Message -----
From: Jerry Mosur <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 25, 2000 1:55 PM
Subject: [TN] Solder Mask


> Thanks for your comments.
>
> We have certainly tried conformal coating with good measure of success.
The
> only drawback was difficult rework and re-application. For high voltage
> circuits we don't specify any solder mask nor conformal coating. For good
> adhesion, we plasma etch board and traces and encapsulate with RTV whole
> assembly. That seems to work O.K. but it is costly and labor intensive
> approach.
> I was hoping there is a new technology / materials that we were not aware
> of, that would make the whole process easier and/or less costly.
>
> Again thanks for your comments.
>
> Jerry Mosur
>
> Spellman High Voltage
>
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