You qualify it initially by SIR/ECMR testing, possibly IC analysis. Once
you have qualified the product and the process, you can then test a
number of identical assemblies in an ionic contamination tester to
establish a process control baseline (mean and standard deviation) for
that type of assembly. If subsequent production testing falls into the
same mean and standard deviation envelope, you can go to bed at night
and sleep soundly on both ears. I recommend this qualification be
repeated, say, annually, to cater for variations.

Brian

Long, Thomas - Avionics wrote:
>         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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