Louis,

Your customer specification ought to tell you whether a coating is required
or not. Generally they do.

You state that the circuit is small and there is a lot of masking (and
therefore de-masking) involved before spraying. How about brushing the
coating?
As an alternative, you could try using a small dispenser such as EFD with
the syringe pre-loaded with the coating material.

Furthermore, I would expect that the coating has to qualified to the US
MIL-I-46058. If so, these must contain a UV tracer to aid inspection. So, if
you do this coating work under a black (UV) light source, then you can see
very clearly where you are putting it - and where you shouldn't!!

Hope this helps,

Regards, Graham Naisbitt

[log in to unmask]

Concoat Ltd             Phone: +44 1276 691100
Alasan House          Fax:      +44 1276 691227
Albany Park
CAMBERLEY
GU15 2PL UK

Any opinions expressed are those of this employer.
-----Original Message-----
From: Louis, Edwin <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 02 February 1999 17:58
Subject: [TN] Conformal Coating on Naval Avionics PWAs


>     Is there anyone out there who knows if conformal coating is necessary
>     for Naval Avionics Printed Circuit Assemblies? We are having problems
>     applying coating to small PWAs with gold areas on the boards.THe cost
>     of  doing intricate masking before spraying is  very high.
>
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