Bruce:
        If the process is wavesolder, how high the wave reach on the board?
Had an instance where the wave was raised a bit too high and the flux was
burned into pieces of blacken debris and it was hard to remove them. Some of
them were stuck to the solder mask and some to the solder joints. Another
possibility could be that the barrels of the boards are oxidized more than
they should due to being old boards that were not protected well during
storage. Heavily oxidized barrels make ugly solder joints. The oxide is
difficult to remove.but only superficial. My two cents.
        Regards,
        Ramon

> -----Original Message-----
> From: Brian Ellis [SMTP:[log in to unmask]]
> Sent: Thursday, November 06, 2003 3:17 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] OCB cleanliness
>
> I would say that this is probably non-saponifiable residue. You would
> probably understand the process better if you stopped calling your
> cleaning solution 'soap'. It is not a soap but an alkaline solution
> which reacts chemically with organic acids in the flux residues to
> **form** a soap. To know what the non-saponifiable residues are, we
> would need to know a lot more about your process, including the flux
> type, soldering process, type of cleaning machine, water quality etc.
>
> Brian
>
> Bruce D Stilmack wrote:
> > We are seeing a condition that has seemed to become a problem in our
> > Manufacture of PCB's.  We are seeing a film or slight amount of
> particulate
> > matter on some of our solder joints.  It gives a dull appearance that
> > almost looks rough.  The substance is dry, and can be brushed away with
> a
> > dry medium coarse brush.  It seems to only adhere to low areas ie the
> > bottom of a fillet.  If an excessive amount of solder is on the joint,
> the
> > joint appears shiny and smooth.  We use an Aqueous cleaner (Electrovert)
> > and a Armakleen soap solution for cleaning.  We change the soap once a
> week
> > and we only do a moderate to small volume business.  Anyone have any
> ideas?
> >
> > Bruce Stilmack
> > GDLS-TO Manufacturing Engineer
> > (850) 574-4773
> > [log in to unmask]
> >
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