1.1 该分类体系涵盖了硫化橡胶材料（天然橡胶、再生橡胶、合成橡胶、单独或组合）的特性，这些材料用于天然气管道应用中的橡胶产品（例如，弹性联轴器、o型环、四密封件和隔膜）。 1.2 该分类系统的前提是，所有橡胶产品的材料特性可以安排为特征材料名称。这些名称由分类系统中描述的类型和类别确定 D2000 . 对于天然气工业管道应用，可以使用本文中的附加要求以及分类系统对材料进行进一步描述 D2000 . 必须注意的是，分类系统中还包括其他类型的弹性体 D2000 本标准未涵盖的。 1.3 在所有情况下，如果该分类系统的规定与特定产品的详细规范的规定相冲突，则应以后者为准。 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。 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。

1.1 This classification system covers the properties of vulcanized rubber materials (natural rubber, reclaimed rubber, synthetic robbers, alone or in combination) that are intended for use in rubber products found in natural gas pipeline applications (for example, elastomeric couplings, o-rings, quad seals, and diaphragms). 1.2 This classification system is based on the premise that the material properties of all rubber products can be arranged into characteristic material designations. These designations are determined by types and classes as described in Classification System D2000 . For gas industry pipeline applications, materials can be further described using additional requirements herein in conjunction with Classification System D2000 . It must be noted that there are other types of elastomers covered in Classification System D2000 that are not covered by this standard. 1.3 In all cases where the provisions of this classification system would conflict with those of the detailed specifications for a particular product, the latter shall take precedence. 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.