Screen Printing Inks are rheopectic fluids that means that viscosity is increased as stress over time increases. You could measure the viscosity by using a Brookfield viscometer but it is much better if you have the whole curve (stress over time).

You need to use a viscometer with a solvent trap to avoid solvent evaporation and thus viscosity evolution during masurement.

The best is to use a rotational rheometer with a cone-plate geometry or  plane-plane geometry..

Note: Rheopectic flow properties are characteristics

not very beneficial for screen printing. Tea

Constantly Becomes thicker product with

Increasing shear rates or squeegee. Therefore

only very slow printing speeds can be when used

processing inks with rheopectic properties.

The best way to measure viscosity of screen printing inks is using rheometer which will give you the viscosity with respect to shear rate