Hi all,

While any other comment would be welcome, I'm going to that
supplier this afternoon to get a clearer view on this and some
other processes.  I'll probably have more questions when I come
back.

JF
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Alain Savard
> Sent: Wednesday, June 14, 2000 12:16 PM
> To: [log in to unmask]
> Subject: Re: [TN] Boards Cleaning II
>
>
> You are NOT paranoid, city water does have ionic contaminants. We used DI
> columns here and recycle the water. You may want to test the board in an
> ionic contamination tester (Omegameter, Contaminometer, Zero-ion...).
>
> I have a question, why so many drying steps?? Is it actual drying or just
> blow-off? Because if it is dried off, there is a good possibility
> that some
> the residue from the flux will stay on the board.
>
> We also use Water Washable flux, we have a simpler cycle:
>
> DI Wash (conductivity = 10 uS max)
> DI rinse (conductivity = 5 uS max)
> DI rinse (conductivity = 2 uS max)
> Air- knife dry
> Compressed air blowing (if required)
>
> Hope this helps,
>
> Alain Savard, B.Sc.
> Chemical Process Analyst
> CAE Electronics Ltd.
> e-mail: [log in to unmask]
>
> -----Original Message-----
> -----Original Message-----
> From: Jean-Francois Bissonnette [mailto:[log in to unmask]]
> Sent: Wednesday, June 14, 2000 11:16 AM
> To: TechNet E-Mail Forum.
> Subject: Board cleaning
>
> I would like to know what is the standard practice for cleaning
> assemblies after soldering.  Our supplier uses water washable flux
> (337M) and uses city water to wash the boards after soldering in
> the following process:
>
> 1) Rinse
> 2) Drying
> 3) Wash
> 4) Wash
> 5) Drying
> 6) Rinse
> 7) Drying
> 8) Pre-Heat
> 9) Drying
> 10) Compressed air blowing
>
> Now I believe that the boards should be clean after such a process, but
> I'm worried about contaminants that could be found in city water.
>
> Am I paranoid???
>
> JF
>
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