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Neminath Instruments

Zahn Cup

Zahn Cup: Measures the viscosity of paints, coatings, and liquids by timing flow through a standardized orifice for quality control.

Zahn Cup

STANDARD : Astm D816, Astm D1084 and Astm D4212.

Description : Zahn Cups provide Viscosity data are useful in the determination of the ease of stirring, pumping, dip coating or other flow related properties of paints,inks, varnishes and syrups . It is made from Stainless Steel and the orifice diameters are precisely manufactured using the modern machinery.

Each Cup has a 12 inch loop handle to allow the cup to be dipped by hand into the liquid container. The Volume of cup is approximately 44 ml. At the center of this handle is a finger-ring for holding the cup in a vertical position during use. The Orifice diameters are set at the factory for accurate results using the standard Newtonian oils.

Ordering Information :

Model

No

Cup No

Normal Orifice Diameter (mm)

Measuring Range

(Cst)

Outflow Time

(Sec)

Applications

NI-ZC-01

No.1

1.98 mm

05-60

35-80

Viscosity of thin bodied materials

NI-ZC-02

No.2

2.74 mm

20-250

20-80

Lacquers, enamel and equivalent

NI-ZC-03

No.3

3.76 mm

100-800

20-80

Viscous paints and inks

NI-ZC-04

No.4

4.27 mm

200-1200

20-80

Paints and Flexographic inks

NI-ZC-05

No. 5

5.28 mm

400-1800

20-80

Silk Screen inks

 

Procedure for use :

  1. Immerse the cup in a container, which may be a can or a beaker but is more likely to be a thinning or mixing tank or even a resin reactor.
  2. Stir and agitate the fluid well to give uniform temperature and density. Allow the cup to remain in the fluid for 1 to 5 mins to attain thermal
  3. Lift the cup vertically out of the material in a quick, steady motion. As the top edge of cup breaks the surface, star the timer. During the time of flow, hold the cup vertically not more than 15.2 cm (6 inch) above the level of liquid.
  4. Stop the timer at the first definite break in the stream at the base of the cup. The Efflux time in seconds constitutes the Viscosity. It is common to make only a single measurement but for greater precision and accuracy means of two or more measurements shall be taken.

 

The Flowtime in seconds is converted into Kinematic Viscosities by the following formula :

V = K (t-c)

Where,

V = Kinematic Viscosity, Cst

t  = Efflux time,t in sec

c = appropriate constants

 

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