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From: "Bill Sloman"
Subject: Re: Why use a solder mask on PCB?
Date: Thu, 3 Oct 2002 00:29:04 +0200
Organization: Planet Internet
References: <firstname.lastname@example.org> <3D9B0679.10F6CFA0@autometer.de>
NNTP-Posting-Date: 2 Oct 2002 22:29:01 GMT
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"Tilmann Reh" wrote in message
> > I am assuming that one reason foor a solder mask is to protect the
> > corrosion. What are the other reasons for having a mask??
> To prevent bad results (shorts) during wave soldering.
The mask is also pretty effective at preventing solder-splashes from
introducing short circuits and unintended connections during hand soldering.
Cambridge Instruments started putting solder masks on all their printed
circuits in the late 1980's, while I was working for them.
This was driven by the quality control and the automatic test groups. About
65% of the faults on the boards that came in were due to solder bridges of
one sort and another, and these faults didn't show up on boards with solder
masks. Saved a lot of time in test and rework, and a whole bundle of money.
I don't think that the solder masks are intended to protect against
corrosion - the plastic is soft and seems pretty permeable, and I'd be
surprised if it were an effective protection.
Bill Sloman, Nijmegen
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