1.1 本规范涵盖聚四氟乙烯（PTFE）树脂的水分散体。这些树脂是四氟乙烯的均聚物，或在某些情况下含有不超过1 % 按其他含氟单体的重量计。 1.1.1 分散液通常由一种或多种表面活性剂稳定。其他非PTFE材料的总量可能为5 % 或用于特殊用途的重量更小。 1.1.2 本规范仅适用于原始材料，不涉及回收材料，因为它不适合分散。 1.2 本规范用于确定PTFE分散体的装运、批次或容器是否适合其预期用途。它仅涵盖聚四氟乙烯的水分散体。它不包括PTFE共聚物或填充分散体。本规范包括水分散体和分散体中PTFE的试验方法。 注1: 本规范涵盖的PTFE分散体的用途包括但不限于:薄膜的浇铸、机械填料和其他材料的浸渍、各种基材上的表面涂层、纤维材料的组合浸渍和涂层，以及与其他材料的共凝聚，以便随后加工成薄膜、薄片、棒和管。 注2: 本规范中的信息在技术上等同于ISO 20568-1和ISO 20568-2中的相关信息。 1.3 以国际单位制表示的数值详见 IEEE/ASTM SI-10 将被视为标准。括号中给出的值仅供参考。 1.4 以下预防性警告仅适用于本规范的试验方法部分。 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和健康实践，并确定监管限制的适用性。 附注5和6中给出了具体的预防信息。 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 specification covers aqueous dispersions of polytetrafluoroethylene (PTFE) resins. These resins are homopolymers of tetrafluoroethylene, or in some cases modified homopolymers containing not more than 1 % by weight of other fluoromonomers. 1.1.1 The dispersion is usually stabilized by one or more surfactants. Other non-PTFE materials may be present in total at 5 % or less by weight for special purposes. 1.1.2 This specification is for virgin material only and does not address recycled material as it is not appropriate for dispersions. 1.2 This specification is used to determine if a shipment, lot, or container of PTFE dispersion is suitable for its intended use. It covers only aqueous dispersions of polytetrafluoroethylene. It does not cover PTFE copolymers or filled dispersions. This specification includes test methods for both aqueous dispersion and the PTFE in the dispersion. Note 1: Uses for the PTFE dispersion covered by this specification include, but are not limited to, casting of their films, impregnation of mechanical packings and other materials, surface coatings on various substrates, combined impregnation and coating of fibrous materials, and co-coagulation with other materials for subsequent processing into films, sheets, rods, and tubes. Note 2: Information in this specification is technically equivalent to related information in ISO 20568-1 and ISO 20568-2. 1.3 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as standard. The values given in parentheses are for information only. 1.4 The following precautionary caveat pertains only to the test method portions of this specification. 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary information is given in Notes 5 and 6. 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.