How clean are your boards and components before soldering? You have to 
qualify a whole process, not just a single component, such as a flux.

Brian

Chafin, Ken G. wrote:
> We are trying to qualify a no-clean flux to be used in our wave solder
> process.
>  
> The flux in question is Indium #9942.
>  
> After wave soldering our boards are conformal coated with polyurethane
> coating Conathane CE-1164. 
>  
> We have done some baking of a test sample at 70 degrees C and and have
> tested per IPC-TM-650 2.6.7.1--thermal shock test.
>  
> This testing was done primarily to evaluate the adequacy of the adhesion
> of the conformal coating.
>  
> We are interested in further evaluating this flux to determine if it
> contributes to corrosion development or other undesirable effects.
>  
> We are considering "soaking" a sample in a chamber at 70 degrees C at
> 95% relative humidity for four or five days.
>  
> I am interested in any recommendations for further
> testing--standards-related tests, nonstandards-related tests that may
> reveal undesirable properties in the flux, etc.
>  
> Thanks
> 
>  
> 
> Kenneth Chafin 
> Quality Compliance Leader 
> 
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