1.1 本试验方法包括通过高温凝胶渗透色谱法（GPC）测定聚烯烃的分子量分布和平均分子量。本试验方法使用市售聚苯乙烯标准和设备，适用于140°C下溶于1,2,4-三氯苯（TCB）的聚乙烯（不包括高压低密度聚乙烯（LDPE）和超高分子量聚乙烯（UHMWPE））和聚丙烯。本试验方法不是绝对的，需要校准。 注1: 尺寸排阻色谱法（SEC）通常用作凝胶渗透色谱法（GPC）的替代名称。 注2: 用户的具体方法和能力可能因实验室之间的列、仪器、应用软件和实践的不同而不同。 注3: 本文概述了一种通用方法；可以遵循其他分析方法，并在适当情况下附在注释中。 注4: 没有已知的ISO等效于本标准。 1.2 以国际单位制表示的数值，基于 IEEE/ASTM S1-10 ，将被视为标准。 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。 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====== 5.1 本试验方法测量聚乙烯（LDPE和UHMWPE除外）和聚丙烯树脂的分子量分布和平均分子量。 分子量和分子量分布的差异显著影响物理性能，如形态、强度、熔体流动等，从而影响由这些树脂制成的产品的最终性能。

1.1 This test method covers the determination of molecular weight distributions and molecular weight averages of polyolefins by high temperature gel permeation chromatography (GPC). This test method uses commercially available polystyrene standards and equipment and is applicable to polyethylenes (excluding high pressure low density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE)) and polypropylenes soluble in 1,2,4-trichlorobenzene (TCB) at 140°C. This test method is not absolute and requires calibration. Note 1: Size exclusion chromatography (SEC) often is used as an alternative name for gel permeation chromatography (GPC). Note 2: Specific methods and capabilities of users may vary with differences in columns, instrumentation, applications software, and practices between laboratories. Note 3: One general method is outlined herein; alternative analytical practices can be followed and are attached in notes where appropriate. Note 4: There is no known ISO equivalent to this standard. 1.2 The values stated in SI units, based on IEEE/ASTM S1-10 , are to be regarded as the 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 This test method measures the molecular weight distribution and molecular weight averages of polyethylene (except LDPE and UHMWPE) and polypropylene resins. Differences in molecular weight and molecular weight distribution significantly affect physical properties, such as morphology, strength, melt flow etc., and as a result, the final properties of products made from these resins.