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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 29 May 2003 13:57:22 +0100 |
Content-Type: | text/plain |
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> 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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