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Subject:	Re: Solder through conformal coating
From:	Graham Naisbitt <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 29 May 2003 13:57:22 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (52 lines)

> 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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