Has anyone tried adding a stage to their DI water where it passes through a
strong alternating magnetic field?  This process would increase the
solubility of the water.  I read some reports in the early 1980s where
Soviet Pulp Mills were using this process to remove scale in their tanks.

Just a wonderment.

   \----------------------\
    \  Kenneth G. Stephens \
     \ President            \
CAD--->CAD 2 CAM, Inc.       >---CAM
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Pat Kane
> Sent: Monday, February 14, 2000 5:48 AM
> To: [log in to unmask]
> Subject: Re: [TN] PWB CLEANING SOLVENTS
>
>
> Douglas
>
> Our evaluations of cleaning OA fluxes with DI water only, has shown that
> there are still corrosive residual levels of contaminants left on the
> surfaces of the PCB.  These corrosive residues have direct impact on field
> performance of your product.  When the DI water is heated, the levels do
> decrease slightly but the residues are still present at levels that pose a
> risk of electromigration and field failures.  The addition of a saponifier
> substantially reduces the residues to acceptable levels.  Many people have
> added heating systems to the DI water and attempted to eliminate the
> saponifier as a cost reducing measure, only to find the resulting
> cleanliness
> levels are too high and the product is at risk for field failure.
>
> Generally, we recommend a customer evaluate the cleaning process by
> performing a baseline assessment of their current activity before
> any changes
> are made in the cleaning process or flux selection.  This gives a
> reference
> point to evaluate the impact of subsequent changes.  Evaluations with
> customers have shown that the combination of hot DI water in addition to
> using a saponifier have proven to be the best at removing
> processing residues
> to acceptable levels.  Subsequent evaluation can be made at this point to
> determine the concentration level of saponifier required in your
> process to
> achieve adequate cleaning.
>
> Hope this helps.  If you need more information, please contact me off line
> for more information.
>
> Regards,
>
> Pat Kane
> Technical Sales Manager
> Contamination Studies Laboratories
> 765-457-8095
>
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