In a message dated 10/30/2000 3:58:02 PM US Eastern Standard Time,
[log in to unmask] writes:

> 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

You might be seeing the residual weak organic acids from the WS flux reacting
with the water to turn white.  In addition to what Brian Ellis has written,
when we see white residues, it is either abietic acid from rosin turning
white or weak organic acids from the flux turning white.  The latter occurs
more frequently with the low solids fluxes since they have a much higher
level of WOAs.

Doug Pauls
CSL

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