Why shouldn’t I just report Zahn viscosity cup readings as seconds efflux time?
A. Remember that there are many different makes of Zahn cups out there that can give you just as many different readings in seconds efflux time, so you can see that only reporting in seconds can many times be unmeaningful and very misleading. As an example, 40.0 seconds efflux in one make cup is 60.8 seconds in another make cup when measuring the same liquid at the same temperature. It is important for you to not only record the seconds efflux time but also it is now possible to determine the actual viscosity of the material by converting seconds to centistokes viscosity using your Gardco Cup Conversion Table. Then you have a meaningful basis of reference that can be relied on. We recommend that you also include the cup maker’s name in your report as well as temperature at time of test. As an example: 30.6 seconds, Gardco EZ Cup #2, 61.3 centistokes viscosity @ 77° F (25° C). Now you have recorded information that you can definitely rely on.
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- Why shouldn’t I just report Zahn viscosity cup readings as seconds efflux time?
