1.1 该分类系统用于识别熔融指数<1g/10min的未填充聚乙烯塑料成型和挤出材料，使供应商和用户就不同商业批次或货物的可接受性达成一致。本规范中涉及的测试旨在提供信息，用于根据所涵盖的组、类别和等级识别材料。该分类系统的功能不是为设计目的提供特定的工程数据。 1.2 该分类系统允许使用回收聚乙烯材料，前提是满足该分类系统中规定的要求。然而，所用回收材料的比例以及任何污染物的性质和数量将不包括在本规范中。 注1: 请参阅指南 D7209 有关再生塑料的信息和定义。 1.3 该分类系统中包含的特性是识别所涵盖成分所需的特性。可能还有其他必要的要求来识别对专业应用程序重要的特定特性。 这些应由用户和供应商通过使用第节中给出的后缀达成一致 5. . 1.4 该分类系统和随后的线形标注（规范）旨在提供一种标注最终产品或零件制造中使用的塑料材料的方法。它不用于材料的选择。材料选择应由在塑料领域具有专业知识的人员在仔细考虑零件的设计和性能要求、将要暴露的环境、所采用的制造工艺、所涉及的成本以及除本分类系统所涵盖的材料之外的材料的固有特性后进行。 1.5 以国际单位制表示的数值被视为标准。 1.6 以下注意事项仅适用于试验方法部分，第节 12 这一分类系统。 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。 1.7 有关塑料管材料的信息，请参见规范 D3350 有关电线和电缆材料的信息，请参阅规范 D1248 有关使用ASTM试验方法对PE模塑和挤出材料进行分类的信息，请参阅规范 D4976 . 注2: 目前还没有与该标准等效的ISO。 1.8 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。

1.1 This classification system provides for the identification of unfilled polyethylene plastics molding and extrusion materials, with a melt index of <1g/10 min, in such a manner that the supplier and the user agree on the acceptability of different commercial lots or shipments. The tests involved in this specification are intended to provide information for identifying materials in accordance with the groups, classes, and grades covered. It is not the function of this classification system to provide specific engineering data for design purposes. 1.2 This classification system allows for the use of recycled polyethylene materials provided that the requirements as stated in this classification system are met. The proportions of recycled material used, as well as the nature and amount of any contaminant, however, will not be covered in this specification. Note 1: See Guide D7209 for information and definitions related to recycled plastics. 1.3 The properties included in this classification system are those required to identify the compositions covered. There may be other requirements necessary to identify particular characteristics important to specialized applications. These shall be agreed upon between the user and the supplier by using the suffixes given in Section 5 . 1.4 This classification system and subsequent line callout (specifications) are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection should be made by those having expertise in the plastic field after careful consideration of the design and the performance requirements of the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent properties of the material other than those covered by this classification system. 1.5 The values stated in SI units are regarded as the standard. 1.6 The following precautionary caveat pertains to the test method portion only, Section 12 of this classification system. 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. 1.7 For information regarding plastic pipe materials, see Specification D3350 . For information regarding wire and cable materials, see Specification D1248 . For information regarding classification of PE molding and extrusion materials using ASTM test methods, see Specification D4976 . Note 2: There is no known ISO equivalent to this standard. 1.8 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.