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Date: | Fri, 30 May 2003 09:13:50 +0800 |
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In my reply to Gusti, I actually wrote in brackets "you'd better take cover
or Graham Naisbit might just try to shoot you for calling it a lacquer
instead of a coating". I removed it before transmission, though, as I
decided to give my sarcasm muscle a rest.
Peter
Graham Naisbitt <[log in to unmask]> 29/05/2003 08:57 PM
Sent by: TechNet <[log in to unmask]>
Please respond to "TechNet E-Mail Forum."; Please respond to Graham
Naisbitt
To: [log in to unmask]
cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
Subject: Re: [TN] Solder through conformal coating
> Hi TechNet $B!G (Bs,
> 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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