Coatings, Paints | Cone-Plate measurements of paints and coatings for automotive industry according to ASTM D7395
This application report shows the standard test method for Cone-Plate viscosity measurements of automotive paints and coatings at a 500 s⁻¹ shear rate according to ASTM D7395 with ViscoQC.
ASTM D7395 is a standardized test method that specifies the procedure for determining the viscosity of paints and related products using a cone-and-plate viscometer operated at a defined shear rate of 500 s⁻¹. This method is designed to simulate the shear conditions encountered during spray application, making it especially relevant for assessing the application behavior of automotive topcoats and other high-performance coatings.
Although the viscosity values obtained through ASTM D7395 do not replicate those derived from traditional efflux cups such as the No. 4 Ford cup, they have been shown to provide an equivalent capability in determining whether a coating meets required specifications and sprayability criteria. As such, this method serves as a robust and precise alternative for quality control, viscosity reduction checks, and producer-user agreements.
Compared to Ford cups, the cone-plate viscometer setup offers superior temperature control, thereby enhancing measurement accuracy and reproducibility. Additionally, this method is suitable for a wide range of paints and coatings, regardless of whether they exhibit Newtonian or non-Newtonian flow behavior.
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