1.1 本试验方法包括测定极压和非极压齿轮油的氧化特性，并包括定量测定总污泥、粘度变化和油损失。 注1: 虽然循环试验使用ISO VG 220极压齿轮油来开发精度数据，但该试验方法可以扩展到其他粘度等级和非极压齿轮机油。参见分类 D2422 用于粘度等级。 1.2 以国际单位制表示的值应被视为标准值。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 齿轮油因氧化或热分解或两者兼而有之而降解，可能会导致油泥堆积，使油不适合进一步用作润滑剂。 5.2 这是唯一一种使用玻璃器皿来测量氧化和热降解过程中产生的污泥量的测试方法。本试验方法是对试验方法的修改 D2893 其测量在95°C下受压的油的粘度增加和沉淀数，但不测量形成的污泥量。 5.3 该试验方法可用于评估齿轮油的氧化/热稳定性。然而，测试结果可能与现场服务中齿轮油的性能无关。

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. ====== Significance And Use ====== 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.