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ASTM D5763-24e1

Current Revision

Standard Test Method for Oxidation and Thermal Stability Characteristics of Gear Oils Using Universal Glassware

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1.1 This test method covers the determination of the oxidation characteristics of extreme pressure and non-extreme pressure gear oils and includes the quantitative determination of total sludge, viscosity change, and oil loss.

Note 1: While the round-robin tests used ISO VG 220 extreme pressure gear oils for developing precision data, the test method can be extended to other viscosity grades and to non-extreme pressure gear oils. Refer to Classification D2422 for viscosity grades.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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, 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.


5.1 Degradation of gear oils by oxidation or thermal breakdown, or both, can result in sludge buildup and render the oil unsuitable for further use as a lubricant.

5.2 This is the only test method that employs glassware to measure the amount of sludge produced during oxidation and thermal degradation. This test method is a modification of Test Method D2893 which measures the viscosity increase and precipitation number of the oil stressed at 95 °C, but does not measure the amount of sludge formed.

5.3 This test method can be used to evaluate the oxidation/thermal stability of gear oils. However, the test results may not correlate with the performance of gear oils in field service.

SDO ASTM: ASTM International
Document Number D5763
Publication Date May 1, 2024
Language en - English
Page Count 5
Revision Level 24e1
Supercedes
Committee D02.09.0D
Publish Date Document Id Type View
May 1, 2024 D5763-24E01 Revision
May 1, 2024 D5763-24 Revision
Nov. 1, 2022 D5763-22A Revision
July 1, 2022 D5763-22 Revision
Dec. 1, 2011 D5763-11 Revision
Nov. 1, 2006 D5763-95R06E01 Revision
Aug. 15, 1995 D5763-95 Revision
Oct. 1, 2016 D5763-11R16 Reaffirmation
Nov. 1, 2006 D5763-95R06 Reaffirmation
Aug. 15, 1995 D5763-95R01 Reaffirmation