The zhan cup (Chai cup), is produced according to some regulations and practical experience of the  from American Material Laboratory Association paint and raw material standard, and Its ASTM number is D4212-93.

• It is used at any place like workshop, factory or laboratory, rapidly test and adjust the viscosity of different fluid.This viscosity cup is to test the viscosity of Newtonian or similar Newtonian  fluid.

How to use? ↓

1. The zahn cup has a 12 inches annular holder, hold it until the cup immerges in the liquid.
2. There is a ring in the middle of the holder; it is for keeping the cup in a vertical condition when immerging.
3. When the cup is filled with liquid, lift it vertically, until the cup all out of the liquid, and then press the stopwatch at the same time.
4. You can see the liquid flows out of the cup through the small hole at the bottom of it .Until all the liquid is flowed off, stop the stopwatch at the same time. Then you will get the viscosity value of the liquid on the stopwatch.
5. The testing result in a special environment must be noted in zahn second, then convert it into centistokes.

Remark: