1.1 本试验方法 2. 涵盖石油或合成液压液水解稳定性的测定。 注1: 水基或水乳液可以通过该测试方法进行评估，但它们是按“原样”运行的没有向100中添加额外的水 g样品。在这些情况下，要求测试的人员需要让测试操作员知道存在水。 1.2 以国际单位制表示的数值应视为标准。括号中的英文单位仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 具体警告声明见 3.1 , 6.1 , 6.3 , 6.9 和 附件A1 . 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本试验方法区分了在试验条件下存在水的液压流体的相对稳定性。水解不稳定的液压油形成酸性和不溶性污染物，由于腐蚀、阀门卡滞或液体粘度变化，可能导致液压系统故障。该测试方法与服务性能之间的相关性程度尚未完全确定。

1.1 This test method 2 covers the determination of the hydrolytic stability of petroleum or synthetic-based hydraulic fluids. Note 1: Water-based or water-emulsion fluids can be evaluated by this test method, but they are run “as is.” Additional water is not added to the 100 g sample. In these cases, the person requesting the test needs to let the test operator know that water is present. 1.2 The values stated in SI units are to be regarded as the standard. The English units given in parentheses are provided 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. Specific warning statements are given in 3.1 , 6.1 , 6.3 , 6.9 and Annex A1 . 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 ====== 4.1 This test method differentiates the relative stability of hydraulic fluids in the presence of water under the conditions of the test. Hydrolytically unstable hydraulic fluids form acidic and insoluble contaminants which can cause hydraulic system malfunctions due to corrosion, valve sticking, or change in viscosity of the fluid. The degree of correlation between this test method and service performance has not been fully determined.