ASTM-D2196 › Standard Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer
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Scope
1.1 These test methods cover the determination of the apparent viscosity and the shear thinning and thixotropic properties of non-Newtonian materials in the shear rate range from 0.1 s−1 to 50 s−1 using a rotational viscometer operating in a fluid contained in a 600 mL low form Griffin beaker.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Significance and Use
3.1 Test Method A is used for determining the apparent viscosity at a given rotational speed, although viscosities at two or more speeds give better characterization of a non-Newtonian material than does a single viscosity measurement.
3.2 With Test Methods B and C, the extent of shear thinning is indicated by the drop in viscosity with increasing rotational speed. The degree of thixotropy is indicated by comparison of viscosities at increasing and decreasing rotational speeds (Test Method B), viscosity recovery (Test Method B), or viscosities before and after high shear (combination of Test Methods B and C). The high-shear treatment in Test Method C approximates shearing during paint application. The viscosity behavior measured after high shear is indicative of the characteristics of the paint soon after application.
Keywords
non-Newtonian; rheological properties; rheology; rotational viscometer; rotational viscosity; shear thinning; thix index; thixotropic; thixotropy; viscometer; viscosity;
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06.01 (Paint -- Tests for Chemical, Physical, and Optical Properties; Appearance)
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Document Number
ASTM-D2196-20
Revision Level
2020 EDITION
Status
Current
Modification Type
Revision
Publication Date
Dec. 14, 2020
Document Type
Test Method
Page Count
5 pages
Committee Number
D01.24