1.1 本试验方法涵盖液压油在低温下储存后的流动性和外观。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.2.1 例外情况- 在里面 6.1.1 ，该材料在cSt中指定，因为这是该类型油的通用名称。 1.3 警告 -许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。 处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.4 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。 有关特定警告声明，请参阅 1.3 和截面 6. . 1.5 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 润滑剂在七天后保持流体和均匀的温度是其承受长期暴露于低温的能力的指标。 对于植物油和一些合成酯，有必要进行长期冷藏试验。快速冷却、短期测试，如测试方法 D97 和 D2500 ，不能充分预测低温下较长时间内的固化趋势。 4.2 本试验方法不旨在表明低温泵送性能。应单独评估粘度性能，以评估冷流特性，这对于避免低温应用中的系统损坏很重要。在实践中可以找到适用于此类测试和各种粘度等级的测试温度的指南 D6080 . 4.3 由于不同粘度等级的流体具有不同的低温性能预期，因此本试验方法中未给出具体的测量温度。有关与预期低温粘度等级或ISO VG相关的温度选择指南，请参阅实践 D6080 .作为使用实践的示例 D6080 ，L22粘度等级将在该等级的最低温度下进行评估，即-22.9 °C。或者，可以在现场服务预期的最低温度下评估流体。

1.1 This test method covers the fluidity and appearance of hydraulic fluids after storage at low temperature. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception— In 6.1.1 , the material is designated in cSt as this is the common name used for this type of oil. 1.3 WARNING —Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.4 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. For specific warning statements, see 1.3 and Section 6 . 1.5 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 The temperature at which a lubricant remains fluid and homogeneous after seven days is an index of its ability to withstand prolonged exposure to cold temperature. With vegetable oils and some synthetic esters, it is necessary to do extended cold storage testing. Quick cool, short-term tests, such as Test Methods D97 and D2500 , do not adequately predict the tendency to solidify over longer time spans at cold temperatures. 4.2 This test method is not intended to indicate cold temperature pumpability performance. A separate assessment of viscometric performance should be made in order to assess cold flow properties, which are important in order to avoid system damage in cold temperature applications. Suitable guidelines for such testing and test temperatures for various viscosity grades can be found in Practice D6080 . 4.3 No specific temperature of measurement is given in this test method because fluids with different viscosity grades have different cold temperature performance expectations. For guidance on temperature selection relative to an intended low temperature viscosity grade or ISO VG, consult Practice D6080 . As an example of using Practice D6080 , a L22 viscosity grade would be evaluated at the lowest temperature for that grade, namely –22.9 °C. Alternatively, a fluid can be evaluated at the lowest temperature expected for field service.