1.1 本试验方法包括评估含聚合物流体的剪切稳定性。试验方法测量粘度损失，单位为mm 2. /s和百分比，100 当通过使用欧洲柴油喷射器测试设备的柴油喷射器装置程序进行评估时，含聚合物流体的温度为°C。粘度损失反映了由于喷嘴处的剪切导致的聚合物降解。粘度损失在30 循环和90 剪切循环。 注1: 本试验方法评估了两种30 循环和90 剪切循环。对于大多数机油，30天后的结果之间存在相关性 90后的循环和结果 剪切循环，但这不是普遍的。 注2: 试验方法 第6278页 使用与30 但没有测试的90个循环部分。 30℃时该试验方法的结果之间的相关性 试验方法的周期和结果 第6278页 研究报告RR:D02-1629中已确定并显示为等效。 注3: 试验方法 第2603页 已用于类似的剪切稳定性评估；限制如重要性声明所示。没有进行详细的尝试来将该测试方法的结果与声波剪切测试方法的测试结果相关联。 注4: 本试验方法使用CEC L-14-A-93中规定的试验装置。该试验方法与CEC-L-14-A-93的不同之处在于校准所需的时间。 注5: 试验方法 D5275型 也在柴油喷射器设备中剪切油，但可能给出不同的结果。 注6: 本试验方法与撤回的试验方法具有不同的校准和操作要求 第3945页 . 1.2 以国际单位制表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。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。 第节给出了具体的警告声明 8. . 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法评估了高剪切喷嘴装置中物理降解导致的流体粘度损失百分比。热效应或氧化效应最小化。 5.2 该试验方法可用于聚合物润滑剂添加剂制造商及其客户的质量控制。 5.3 本试验方法并非旨在预测不同现场设备在广泛变化的操作条件下的现场服务粘度损失，这可能会导致润滑剂粘度因热变化和氧化变化以及聚合物的机械剪切而发生变化。然而，当现场使用条件主要或唯一导致聚合物通过机械剪切降解时，该试验方法的结果与现场结果之间可能存在相关性。

1.1 This test method covers the evaluation of the shear stability of polymer-containing fluids. The test method measures the viscosity loss, in mm 2 /s and percent, at 100 °C of polymer-containing fluids when evaluated by a diesel injector apparatus procedure that uses European diesel injector test equipment. The viscosity loss reflects polymer degradation due to shear at the nozzle. Viscosity loss is evaluated after both 30 cycles and 90 cycles of shearing. Note 1: This test method evaluates the shear stability of oils after both 30 cycles and 90 cycles of shearing. For most oils, there is a correlation between results after 30 cycles and results after 90 cycles of shearing, but this is not universal. Note 2: Test Method D6278 uses essentially the same procedure with 30 cycles but without the 90 cycles portion of the test. The correlation between results from this test method at 30 cycles and results from Test Method D6278 has been established and shown in Research Report RR:D02-1629 to be equivalent. Note 3: Test Method D2603 has been used for similar evaluation of shear stability; limitations are as indicated in the significance statement. No detailed attempt has been undertaken to correlate the results of this test method with those of the sonic shear test method. Note 4: This test method uses test apparatus as defined in CEC L-14-A-93. This test method differs from CEC-L-14-A-93 in the period of time required for calibration. Note 5: Test Method D5275 also shears oils in a diesel injector apparatus but may give different results. Note 6: This test method has different calibration and operational requirements than withdrawn Test Method D3945 . 1.2 The 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. 1.3 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 Section 8 . 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 This test method evaluates the percent viscosity loss of fluids resulting from physical degradation in the high shear nozzle device. Thermal or oxidative effects are minimized. 5.2 This test method may be used for quality control purposes by manufacturers of polymeric lubricant additives and their customers. 5.3 This test method is not intended to predict viscosity loss in field service in different field equipment under widely varying operating conditions, which may cause lubricant viscosity to change due to thermal and oxidative changes, as well as by the mechanical shearing of polymer. However, when the field service conditions, primarily or exclusively, result in the degradation of polymer by mechanical shearing, there may be a correlation between the results from this test method and results from the field.