Sorry to be negative, but, in all probability, you could be suffering
from the problems often engendered by a closed loop system which doesn't
remove all the chemicals effectively. I ALWAYS recommend the final rinse
to be an open circuit one with freshly deionised incoming water, unless
you have a VERY sophisticated recycling system that will remove all the
organics (carbon filters are effective only for a given range of
molecule sizes and, even then, only if they are changed/regenerated
regularly: they are quickly overloaded by flux components). The
difference between glossy and matt is classic: water will spread more
readily on a structured surface and form globules on an unstructured
surface of a similar composition. It isn't because there is more
residual contamination on the glossy surface: you just see it more
easily.

Brian

[log in to unmask] wrote:
>
> Hello fellow Technetters
>
> I have been reading the postings for a long time, thought this would be
> a good place to get my questions answered.
> I have an Aqueous technology batch cleaner.
> The cleaner washes the board then go into a drying cycle.
> It is a closed loop system with a 5 micron filter.
> Everything I use in my process is water soluble.
> Everytime I wash semi-gloss finish boards there are water spots all
> over the boards.
> Mat finish boards come out spot less.
> Has any one experience this before ?
> Why is this happening ?
> Do I need to add any chemical or solvent to the water?
>
> Any comments would be greatly appreciated.
>
> Thanks in advance
> Carl.
>
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