William

Thank you very much for your comments.
First I am really sorry about the the mess with my E- mails to TechNet. I
got a whole bunch of messages from our local server as well as from some
"SMTPLINK-anything" that my messages are undeliverable and now it seems
that some came trough without my address. Maybe there will be some more
soon.

Concerning your questions:

Instrument: Protonique Contaminometer CEM5.
Test solution: 1/1 Water/Isopropanol.
Test time: Max. 15 Min. or less than 1 percent change of the last 12
measurements average.
Temperature: 22-25°C

I find your comments very interesting. I think I should go after the fact
you mentioned that water soluble fluxes cleaned with water just seem
cleaner than others in ICT. However, I had the impression that my results
correlate well with the measurement of the thickness of the residues with
the help of microsections. Anyway I fell it would be exiting to do more
work in this field.

Guenter Grossmann