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Zahn cup, also known as the dip-type viscosity cup, is an American-standard gravity efflux viscometer following **ASTM D4212, Standard Test Method for Dip-Type Viscosity Cups**. It is a portable viscosity testing tool commonly used in spray and ink workshops across Europe and America. It is designed to quickly measure the efflux time in seconds (Zahn seconds) of **Newtonian / near-Newtonian liquids**, and the result can be converted to kinematic viscosity in cSt (centistokes).
Description: NT 102 Zahn Cups can be used to quickly measure the viscosity of liquids such as Paint, Ink, Varnishes, Syrup and Oil. It is produced according with ASTM D 816, ASTM D 1084,ASM D 4212.The Stainless Steel Cups are molded precisely and the orifices are precision drilled using high-speed CNC drilling.
Each cup has a 12-inch loop handle to allow the cup to be dipped by hand into a liquid container. At the center of this handle is a finger-ring for holding the cup in a vertical position during use. Its orifice diameters adjusted at the factory for appropriate results with applicable NIST traceable Newtonian oils.
It is done by filling up the volume of Zahn Cup with the required liquid, and then used a index finger to stop any flow out of the liquid. A ring at the Zahn Cup handle allows the cup to be hanged perpendicularly（still with the finger stopping any liquid flow out）.Prepare a Digital stopwatch and set zero. Immediately start the stopwatch when the finger is released. As soon as there is a first “break” of the flow, stop the stopwatch. The second shown is the time of the liquid flow, which is also the flow viscosity of that liquid.
Technical Parameters：
■ Volume of Cup：44ml
■ Length of Handle：40±0.1mm
■ Height of Cup：58±0.1mm
■ Measurement Temperature：25℃±1℃
■ Details of each Zahn Cups
| Details/Zahn cup | Zahn cup 1# | Zahn cup 2# | Zahn cup 3# | Zahn cup 4# | Zahn cup 5# | ||
| Orificф（cm/inches） | 1.98/0.08 | 2.74/0.11 | 3.76/0.15 | 4.27/0.17 | 5.28/0.21 | ||
| Zahn Range （sec） | 33.5-80 | 20-80 | 20-75 | 20-80 | 20-80 | ||
| Centistokes Range | 5-56 | 21-231 | 146-848 | 222-1110 | 460-1840 | ||
| Applications | Very Thin Oil | Thin Oil，Paint | Lacquer | Medium Oil | Mixed Paint | Viscous Liquid and Mixtures | Very Viscous Mixtures |
| Ordering Information | NT 102/1 | NT 102/2 | NT 102/3 | NT 102/4 | NT 102/5 |
NOTE：Both the Zahn Cups and the Iwata Cup are based on measuring the Flow of liquid in seconds. Hence, a precision stopwatch is required.
Results should be reported in Zahn-Seconds at a specified temperature for a particular cup. To convert Zahn-Seconds to centistokes, refer to ASTM D 4212
Centistokes×Specific Gravity=Centiposie
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