1.1 本规程涵盖了标准玻璃-金属夹层密封件的制备和测试，用于确定玻璃中的应力或确定玻璃和金属之间的热膨胀（或收缩）失配程度。试验按照试验方法进行 F218 （第2节）。 1.2 本规程适用于电子元件生产中通常密封在一起的所有玻璃和金属（或合金）组合。 1.3 在推导失配方面，测试的实际极限约为300 ppm，超过该极限玻璃可能会破裂。 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。 ====意义和用途====== 4.1 本规程中使用的术语“参考”意味着参考玻璃金属密封件的玻璃或金属将是“标准参考材料”，例如国家标准与技术研究所提供的用于其他物理测试的材料，或二次参考材料，其密封特性已通过标准参考材料的密封件确定（见NBS特别出版物260）。在NIST制定密封标准参考材料之前，制造商和买方可就二次参考材料达成一致。

1.1 This practice covers the preparation and testing of a reference glass-metal sandwich seal for determining stress in the glass or for determining the degree of thermal expansion (or contraction) mismatch between the glass and metal. Tests are in accordance with Test Method F218 (Section 2). 1.2 This practice applies to all glass and metal (or alloy) combinations normally sealed together in the production of electronic components. 1.3 The practical limit of the test in deriving mismatch is approximately 300 ppm, above which the glass is likely to fracture. 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. ====== Significance And Use ====== 4.1 The term “reference” as employed in this practice implies that either the glass or the metal of the reference glass-metal seal will be a “standard reference material” such as those supplied for other physical tests by the National Institute of Standards and Technology, or a secondary reference material whose sealing characteristics have been determined by seals to a standard reference material (see NBS Special Publication 260). Until standard reference materials for seals are established by the NIST, secondary reference materials may be agreed upon between manufacturer and purchaser.