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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 29 May 2003 16:46:35 +0300 |
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Not recommended to repair in such way.
Any way you have to re coat again this area.
Best Regards
ROKAH Reuven
Graham Naisbitt
<Graham.Naisbitt@CON To: [log in to unmask]
COAT.CO.UK> cc:
Sent by: TechNet Subject: Re: [TN] Solder through conformal coating
<[log in to unmask]
C.ORG>
29/05/03 03:57 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to Graham
Naisbitt
> Hi TechNet's,
> I am in the situation to reduce time consuming with masking and
de-masking
> a couple of pads for an assembly covered with an acrylic lacquer. I am
> asking if someone have tried to solder by hand a component (with
gull-wing
> terminals) without remove the conformal coating. I have experimented and
> observed that it can be done. It is a silly question or not?
> Any reaction will be welcomed.
> Gusti
>
Gusti
Please stop calling it lacquer - it almost certainly is NOT a lacquer but a
coating. Yes there is a difference between a conformal coating and a
lacquer, although certain languages do not allow for this level of
discrimination.
Make sure that the tip of the iron is at least 300 Deg C or more and you
should be able to "burn-through" the coating "vaporising" it and producing
nothing more harmful that some Carbon Monoxide and Carbon Dioxide. Fume
extraction is a good thing!
I would check with your component supplier, how well it will tolerate such
an elevated temperature during a hand soldering operation.
I would be cautious that you might subsume some coating residues into the
solder alloy - so some extended environmental testing would be a sensible
precaution.
If your end product will damage people if it fails, then such extended
testing would seem to me, mandatory.
--
Regards Graham Naisbitt
[log in to unmask]
Concoat Limited - Engineering Reliability in Electronics
Web: www.concoat.co.uk and www.concoatsystems.com
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