Hello Doug,

Sounds like you need to switch to a Zahn #1 cup.  Here is a link to the Zahn cup section of the Guardco website that Lloyd mentioned.  http://www.gardco.com/pages/viscosity/vi/s90.cfm  

The Zahn #1 cup should be able to read the viscosity of the thinned coating that you are describing.  


Best regards,

Tony Lentz
FCT Assembly
Field Application
[log in to unmask]
970-566-0360 Mobile

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, April 15, 2015 2:23 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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