My thoughts as follows :
> You need to be careful with Zahn cups from Gardco. They have a industry standard  Zahn cup series and their own  Zahn cup "signature series". The latter is new and improved however will not provide the same valves as the standard Zahn cup.
> I remember reading somewhere that a  good Zahn cup  range  should be 20 -40 second. < 20 seconds and GR&R is  poor due to reaction times  and operator error being too high. >45 seconds and too long for most people's attention span. 

Rich  Kraszewski 
(920) 969-6075

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, April 15, 2015 3:23 PM
To: [log in to unmask]
Subject: [TN] Viscosity Cups

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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