Good afternoon all,

I have a silly question.  We conformally coat using  a common solvent based
acrylic coating.  One process control method is to periodically measure
coating viscosity using a Zahn #2 cup, which works well for this particular
coating that has about a 55-60 second flow.  I am finding that when this
coating is thinned down for spray, the times are down in the 15-18 second
range and the variation is increasing.

So, my question - is there a style of viscosity dip cup, e.g. Ford, DIN,
etc., that is more amenable to thin viscosity coatings?  It is understood
that a precision instrument like a Brookfield viscometer would be
preferrable, but production is NOT going to let me get a few dozen of them.

Thanks.

Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins


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