Extensional Viscosity of Coating Color Evaluated as Euler Number Using Orifice Rheometer, Test Method T 583 pm-24
This method describes a procedure for measuring the Euler number of coating colors using a High-Shear Viscometer with an orifice configuration.
In this method, the extensional viscosity is evaluated by calculating the Euler number when the coating color flows through an orifice at a velocity of 15 m/s.
The method is applicable for water-based coating colors used in various coating processes such as in blade, rod, and curtain coating. Typically, suitable coating colors have a solids content between 30 % and 80 %, and they contain mineral pigments, synthetic and / or natural polymers and coating additives.
An Euler number of 1-2 signifies a lack of extensional viscosity in the sample. Euler numbers of 2-5 signify moderate amounts of extensional viscosity, while numbers over 5 signify high extensional viscosity. Typical extensional viscosity values can be seen in Appendix E.
Extensional Viscosity of Coating Color Evaluated as Euler Number Using Orifice Rheometer T 583 pm-24
