Brain: Continuing with your thoughts, we have been able to create white res on WS fluxed
boards by washing them blistering hot, straight out of the wave.  So, even when we were shrewd
enough to control our was temps, we were still able to beat ourselves.  Tricky eh?  Dave Fish

Brian Ellis wrote:

> Jon
>
> This is a truth that many people overlook. Many WS flux/paste
> chemistries use amine- or amino acid-hydrohalide activators and these
> have a behaviour like egg white - they dissolve well in cold but set at
> higher temps in the presence of water. I recommend a max of 50°C for the
> wash cycle with these. Rinse temps can be progressively higher. If a
> prewash is possible (or use of a chelating neutraliser, which I
> recommend), then this is best at cold.
>
> Brian
>
> Jon Moore wrote:
> >
> > Janice,
> >      What temperatures are your wash / rinse cycles?  I found white residues
> > routinely with water soluble chemistries and OSP panels following wave
> > solder, and it turned out that my temperatures were set too high.
> >
> > Jon Moore
> >
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