1.1 这些试验方法涵盖了用作电绝缘的聚四氟乙烯管的试验程序。以下章节介绍了这些程序: 程序 小节 ASTM标准 方法 条件作用 7. . 介质击穿电压 28 – 30 D149 , D876 内径 8 – 13 D876 心轴弯曲试验 46 – 52 D149 , D876 熔点 41 – 45 D3418页 , D4895 渗透试验 26和 27 D876 比重 36 – 40 D792 , D1505 应变消除 31 – 35 . 挥发性损失 20 – 25 . 壁厚 14 – 19 . 注1: 这些试验方法与IEC 60684-2中的试验方法相似，但不完全相同。 1.2 除以摄氏度表示的温度外，以英寸-磅单位表示的数值为标准值。括号中的值仅供参考。 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。 有关具体的警告声明，请参阅第节 5. . 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====== 4.1 本标准中的试验方法对于表征聚四氟乙烯管的特性非常重要。它们主要用于但不限于聚四氟乙烯管。 4.2 可使用这些方法的变化或替代的当代测量方法来确定本标准中特性的值，前提是此类方法确保质量水平和测量精度等于或优于本文规定的质量水平和测量精度。使用替代试验方法的组织有责任证明这种情况。 如有争议，应采用本文规定的方法。 注2: 提供替代方法是必要的，因为（1）希望简化特定应用的程序，以及（2）希望消除冗余测试并使用制造过程控制期间生成的数据，包括在统计过程控制（SPC）条件下生成的数据，使用本文规定以外的设备和方法。例如，使用激光千分尺或光学比较仪测量尺寸。

1.1 These test methods cover procedures for testing polytetrafluoroethylene tubing for use as electrical insulation. The procedures appear in the following sections: Procedure Sections ASTM Methods Conditioning 7 . Dielectric Breakdown Voltage 28 – 30 D149 , D876 Inside Diameter 8 – 13 D876 Mandrel Bend Test 46 – 52 D149 , D876 Melting Point 41 – 45 D3418 , D4895 Penetration Test 26 and 27 D876 Specific Gravity 36 – 40 D792 , D1505 Strain Relief 31 – 35 . Volatile Loss 20 – 25 . Wall Thickness 14 – 19 . Note 1: These test methods are similar but not identical to those in IEC 60684–2. 1.2 The values stated in inch-pound units are the standard except for temperature, which is stated in degrees Celsius. Values in parentheses are for information only. 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. For specific warning statements, see Section 5 . 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 ====== 4.1 The test methods in this standard are considered important to characterize polytetrafluoroethylene tubing. They are intended primarily for, but not limited to polytetrafluoroethylene tubing. 4.2 Variations in these methods or alternate contemporary methods of measurement may be used to determine the values for the properties in this standard provided such methods ensure quality levels and measurement accuracy equal to or better than those prescribed herein. It is the responsibility of the organizations using alternate test methods to be able to demonstrate this condition. In cases of dispute, the methods specified herein shall be used. Note 2: Provision for alternate methods is necessary because of (1) the desire to simplify procedures for specific applications, and (2) the desire to eliminate redundant testing and use data generated during manufacturing process control, including that generated under Statistical Process Control (SPC) conditions, using equipment and methods other than those specified herein. An example would be the use of laser micrometers or optical comparators to measure dimensions.