I don't know about a spec,
        but call Nordson or PVA (I've heard of other brands, but never used
them) and get a robotic spray system that doesn't need masking. I've seen
few assemblies that can't be sprayed with this kind of system.

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 2/2/99 2:05 PM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]

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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