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ASTM D971-20

Current Revision

Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method

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1.1 This test method covers the measurement of the interfacial tension between insulating liquid that has a relative density (specific gravity) less than water and water, under non-equilibrium conditions.

1.2 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. See 7.2 for a specific warning statement.

1.3 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.


4.1 Interfacial tension measurements on electrical insulating liquids provide a sensitive means of detecting small amounts of soluble polar contaminants and products of oxidation. A high value for new mineral insulating oil indicates the absence of most undesirable polar contaminants. The test is frequently applied to service-aged mineral oils as an indication of the degree of deterioration.

Note 1: Different liquid matrixes are reviewed in Appendix X1.

SDO ASTM: ASTM International
Document Number D971
Publication Date April 1, 2020
Language en - English
Page Count 4
Revision Level 20
Supercedes
Committee D27.07
Publish Date Document Id Type View
April 1, 2020 D0971-20 Revision
May 1, 2012 D0971-12 Revision
Oct. 10, 1999 D0971-99A Revision
Not Available D0971-91 Revision
Oct. 1, 2004 D0971-99AR04 Reaffirmation