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ASTM D2783-21
Standard Test Method for Measurement of Extreme-Pressure Properties of Lubricating Fluids (Four-Ball Method)
1.1This test method covers the determination of the load-carrying properties of lubricating fluids. The following two determinations are made:
1.1.1Load-wear index (formerly Mean-Hertz load).
1.1.2Weld point by means of the four-ball extreme-pressure (EP) tester.
1.2For the determination of the load-carrying properties of lubricating greases, see Test Method D2596.
1.3The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.4This 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.
1.5This 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.
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