I liken it to washing your hands with Lava soap...gets all that grime and
dirt from the hard to reach crevices, nooks, and cranny's while at the same
time roughening up the surface providing for greater surface area and
adhesion.
----- Original Message -----
From: "Russell Burdick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 11, 2004 8:21 AM
Subject: Re: [TN] Solder Mask Flaking
> I've seen this defect remove the hair of a good process engineer at a
> previous employer. Ground plane copper with any residual moisture then add
> LPI and the result is peeling/flaking soldermask.
>
> We did not have an option for pumice, but the alternative oxide processes
> created a great surface prep prior to LPI mask. Not to mention the
chemistry
> is stable and dirt cheap. In my old days I remember people describing
pumice
> scrubbers as capable of 'eating themselves slowly', I'm unsure of costs
> related to keeping one satisfied to chewing on the panels instead.
>
>
> >From: Franklin D Asbell <[log in to unmask]>
> >Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,
Franklin
> >D Asbell <[log in to unmask]>
> >To: [log in to unmask]
> >Subject: Re: [TN] Solder Mask Flaking
> >Date: Wed, 11 Feb 2004 07:33:53 -0600
> >
> >Totally agree...
> >
> >
> >----- Original Message -----
> >From: "Brian Ellis" <[log in to unmask]>
> >To: <[log in to unmask]>
> >Sent: Wednesday, February 11, 2004 2:16 AM
> >Subject: Re: [TN] Solder Mask Flaking
> >
> >
> > > The key is post pumice rinse/clean/dry...the boards need to exit the
> > > machine spotless... and poorly solderable!
> > >
> > > Brian
> > >
> > > Franklin D Asbell wrote:
> > >
> > > > Tony,
> > > >
> > > > Do you have a pumice scrubber? We use an Hyoki aluminum oxide pumice
> > > > scrubber prior to solder mask. Since buying this machine our
problems
> >with
> > > > solder mask have dropped off to near nothing.
> > > >
> > > > We did tests some time back when we were evaluating different masks,
> >we
> > > > coated an 18X24 panel after pumice scrub...it came out nice and
flat,
> > > > smooth, even, etc etc etc...we could not have achieved those results
> >without
> > > > it I'm sure...
> > > >
> > > > The key is post pumice rinse/clean/dry...the boards need to exit the
> >machine
> > > > spotless...
> > > >
> > > > Franklin
> > > >
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