1.1 本规范涵盖三种适用于制造电子管、灯具和其他设备零件的拉丝；以及一种用于金属-玻璃密封的杆（网格线除外）: 1.1.1 1A型- 商用纯非银导线( 注释2 和 附注3 ). 1.1.2 1B型- 适用于金属对玻璃密封的商用纯杆。 1.1.3 2A型- 含1的钍丝 % 托里亚。 1.1.4 2B型- 含2的钍丝 % 托里亚。 1.2 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.3 1A和1B型被指定为UNS R07005。2A型被指定为UNS R07911。2B型被指定为UNS R07912。 1.4 以下预防性警告仅适用于本规范第12节的化学分析: 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。 注1: 一种用于测试0.030英寸以上非银钨丝的尺寸测量方法。试验方法中提供了直径（0.76 mm） F269页 . 注2: 生产商和消费者应根据显微照片所示的闪光微观结构或根据试验方法确定的尺寸测量极限，就特定尺寸应用的非银导线特性验收达成协议 F269页 . 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 three types of drawn wire suitable for fabrication into parts for electron tubes, lamps, and other devices; and one type of rod for metal-to-glass sealing (grid wire is excepted): 1.1.1 Type 1A— Commercially pure nonsag wire ( Note 2 and Note 3 ). 1.1.2 Type 1B— Commercially pure rod suitable for metal-to-glass sealing. 1.1.3 Type 2A— Thoriated filament wire containing 1 % thoria. 1.1.4 Type 2B— Thoriated filament wire containing 2 % thoria. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 Types 1A and 1B are designated as UNS R07005. Type 2A is designated as UNS R07911. Type 2B is designated as UNS R07912. 1.4 The following precautionary caveat pertains only to the Chemical Analysis, Section 12 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: A dimensional measurement method for testing nonsag tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test Method F269 . Note 2: Acceptance of nonsag wire characteristics for particular applications of size shall be by agreement between producer and consumer based on either a flashed microstructure as shown by photomicrographs, or on dimensional measurement limits determined in accordance with Test Method F269 . 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.