Good Morning Thomas,

We would suggest doing a combination of Ion Chormatography (IC) and Surface
Insulation Resistance (SIR) to qualify new materials, especially when
transitioning to a new flux.  The IC will allow you to characterize the flux
by identifying and quantifying the remaining ionic species post processing.
Additionally, the IC can aid in determining if your aqueous cleaning process
is effective at removing the remaining flux residues. Further, IC can
identify many different organic species. Omegameters do not have the ability
to specify each ion species, rather the value that is generated is for the
total ionic (all ionic speicies) content measured on the board.

SIR is good for determining if the leftover flux residues are going to put
your boards at risk of electrochemical problems, such as dendritic growth
and/or corrosion.

It has been our experience that the combination of these two tests gives a
pretty good overall feel for how the the flux will perform from a residue
standpoint.  Hope this helps. If you would like to discuss further, please
feel free to contact me offline.

Best Regards,

Joe Russeau
Process Analyst

Precision Analytical Laboratory, Inc.
4106 Cartwright Dr. Ste. A
Kokomo, IN 46902

P: 765-455-1993
F: 765-455-1996
E: [log in to unmask]


----- Original Message -----
From: "Long, Thomas - Avionics" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 22, 2005 9:00 AM
Subject: [TN] Water Soluble Flux


>         I am looking for some advice on qualifying a process for
> switching from RMA flux to water soluble flux.  I am aware that a large
> company learned through SIR testing (too late) that when switching from
> RMA to water soluble their cleaning process was not effectively cleaning
> all of the flux residues off and it was causing performance issues.  The
> company actually had to scrap product and revisit type of flux and
> cleaning.  I'm not sure if organic flux residues can be detected with
> omegameter cleanliness testing and this product is class 3 high rel.
>
>         I appreciate any input and experiences that anyone can share.
>
> Tom Long
> ITT Avionics
>
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