Hi Victor - I once had one of my mentors state " there are as many flux
formulations as there are shapes of snow flakes". There are whole chapters
of books devoted to flux and flux formulations. You will need to give us a
much more specific question to get useful responses.

Dave Hillman
Rockwell Collins
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On Fri, Apr 24, 2015 at 2:31 PM, Victor Hernandez <
[log in to unmask]> wrote:

> Fellow TechNetters:
>
>    Are all LF solder fluxes created equal?   I often see m/b with more
> flux residue, dry-crusty-yellowish, accumulated around the solder joint.
> Yet others are almost free of flux residue.   I do see that either solder
> form a glassy halo around the solder joint at the solder mask surface.
>  What are the Pros & Cons.   The solder flux residue is more pronounced on
> Filed return assemblies or those which have been subject to reliability
> testing, HALT, HASS, S&V & T/C
>
> Victor,
>
>
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