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现行 ASTM D4894-19(2024)
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Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials 聚四氟乙烯(PTFE)颗粒模塑和冲压挤压材料的标准规范
发布日期: 2024-05-01
1.1 本规范涵盖了从未预成型或模制过的聚四氟乙烯(PTFE)的粒状树脂和试验方法,这些树脂通常通过类似于粉末冶金或陶瓷中使用的方法或特殊挤压工艺进行加工。这些PTFE树脂是四氟乙烯的均聚物,或者在某些情况下是含有不超过1%重量的其它含氟单体的改性均聚物。加工热塑性塑料的通常方法通常不适用于这些材料,因为它们在加工温度下具有粘弹性。本文所包括的材料不包括PTFE树脂与添加剂如着色剂、填料或增塑剂的混合物;也不包括再加工或再研磨的树脂或任何制成品。所包括的方法和特性是识别各种类型树脂所需的方法和性能。附录中提供了进一步表征树脂的附加程序。 1.2 以国际单位制表示的数值详见 IEEE/ASTM SI-10 被视为标准,并且的实践 IEEE/ASTM SI-10 并入本文。 1.3 以下注意事项仅适用于样本制备部分,第节 9 ,以及“测试方法”部分,第节 10 ,本规范的: 本规范并非旨在解决与其使用相关的所有安全问题(如有)。本标准的使用者有责任在使用前建立适当的安全和健康实践,并确定监管限制的适用性。 具体警示说明见附注3和附注9。 注1: 本规范中的信息在技术上等同于ISO 12086-1和ISO 12086-2中的相关信息。 1.4 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 specification covers granular resins and test methods for polytetrafluoroethylene (PTFE) that have never been preformed or molded and are normally processed by methods similar to those used in powder metallurgy or ceramics, or by special extrusion processes. These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, modified homopolymers containing not more than one percent by weight of other fluoromonomers. The usual methods of processing thermoplastics generally are not applicable to these materials because of their viscoelastic properties at processing temperatures. The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles. The methods and properties included are those required to identify the various types of resins. Additional procedures are provided in the Appendix for further characterization of the resins. 1.2 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard, and the practices of IEEE/ASTM SI-10 are incorporated herein. 1.3 The following precautionary caveat pertains only to the Specimen Preparation section, Section 9 , and the Test Methods section, Section 10 , of this specification: This specification 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. See Notes 3 and 9 for specific cautionary statements. Note 1: Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2. 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.
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归口单位: D20.15
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