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Standard Practice for Rheological Characterization of Architectural Coatings using Three Rotational Bench Viscometers
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STANDARD published on 1.2.2017
Designation standards: ASTM D7394-17
Note: WITHDRAWN
Publication date standards: 1.2.2017
SKU: NS-678304
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
Keywords:
cone/plate-type viscometer, high-shear viscosity, Krebs unit viscometer, low-shear viscosity, mid-shear viscosity, paints, rheology, viscosity,, ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)
Significance and Use | ||||||||||||||||||||||||
5.1 A significant feature of this practice is the ability to survey coating rheology over a broad range of shear rates with the same bench viscometers and test protocol that paint formulators and paint quality control (QC) analysts routinely use. By using this procedure, measurement of the shear rheology of a coating is possible without using an expensive laboratory rheometer, and performance predictions can be made based on those measurements. 5.2 Low-Shear Viscosity (LSV)—The determination of low-shear viscosity in this practice can be used to predict the relative “in-can” performance of coatings for their ability to suspend pigment or prevent syneresis, or both. The LSV can also predict relative performance for leveling and sag resistance after application by roll, brush or spray. Fig. 1 shows the predictive low-shear viscosity relationships for several coatings properties. |
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1. Scope | ||||||||||||||||||||||||
1.1 This practice covers a popular industry protocol for the rheological characterization of waterborne architectural coatings using three commonly used rotational bench viscometers. Each viscometer operates in a different shear rate regime for determination of coating viscosity at low shear rate, mid shear rate, and at high shear rate respectively as defined herein. General guidelines are provided for predicting some coating performance properties from the viscosity measurements made. With appropriate correlations and subsequent modification of the performance guidelines, this practice has potential for characterization of other types of aqueous and non-aqueous coatings. 1.2 The values in common viscosity units (Krebs Units, KU and Poise, P) are to be regarded as standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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