1.1 本试验方法涵盖了在加工设备常见的各种温度和剪切速率下测量聚合物材料的流变性能。它涵盖了熔体粘度的测量、灵敏度或熔体粘度相对于流变仪中温度和聚合物停留时间的稳定性、模头膨胀比（聚合物记忆）以及在恒定速率或应力下挤出时的剪切灵敏度。所描述的技术允许对表现出稳定和不稳定熔体粘度特性的材料进行表征。 1.2 该测试方法已被发现可用于增强和未增强热塑性塑料、热固性材料的固化周期以及具有广泛熔体粘度的其他聚合物材料的质量控制测试。 1.3 以国际单位制表示的值应被视为标准值。括号中给出的英寸-磅单位仅供参考。 注1: 尽管本试验方法和ISO 11443-1995“塑料——使用毛细管和狭缝模流变仪测定塑料的流动性”在方法或细节上有所不同，但使用ISO 11443方法A获得的数据在技术上与本试验方法等效 1.4 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。 1.5 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====== 4.1 该测试方法对聚合物分子量和分子量分布、聚合物稳定性（热和流变性）、剪切不稳定性以及增塑剂、润滑剂、水分增强剂或惰性填料等添加剂或其组合敏感。 4.2 该测试方法的灵敏度使数据可用于与加工条件相关联，并有助于预测加工条件的必要变化。与测试方法不同 D1238 该测试方法在通常低于加工条件的剪切速率下进行单点测量，确定加工剪切速率下的剪切敏感性和流动特性，因此用于比较不同成分的材料。

1.1 This test method covers measurement of the rheological properties of polymeric materials at various temperatures and shear rates common to processing equipment. It covers measurement of melt viscosity, sensitivity, or stability of melt viscosity with respect to temperature and polymer dwell time in the rheometer, die swell ratio (polymer memory), and shear sensitivity when extruding under constant rate or stress. The techniques described permit the characterization of materials that exhibit both stable and unstable melt viscosity properties. 1.2 This test method has been found useful for quality control tests on both reinforced and unreinforced thermoplastics, cure cycles of thermosetting materials, and other polymeric materials having a wide range of melt viscosities. 1.3 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are for information only. Note 1: Although this test method and ISO 11443–1995, “Plastic—Determination of the Fluidity of Plastics Using Capillary and Slit-Die Rheometers” differ in approach or detail, the data obtained using ISO 11443, Method A is technically equivalent to this test method 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. 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 This test method is sensitive to polymer molecular weight and molecular weight distribution, polymer stability—both thermal and rheological, shear instability, and additives such as plasticizers, lubricants, moisture reinforcements, or inert fillers, or combination thereof. 4.2 The sensitivity of this test method makes the data useful for correlating with processing conditions and aids in predicting necessary changes in processing conditions. Unlike Test Method D1238 , which makes a one-point measure at a shear rate typically below processing conditions, this test method determines the shear sensitivity and flow characteristics at processing shear rates, and therefore is used to compare materials of different compositions.