1.1 本试验方法涵盖了一个实验室程序，用于确定热老化对建筑施工中使用的现场固化弹性接缝密封剂（单组分和多组分）的重量损失、开裂和粉化的影响。 1.2 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.3 目前还没有与此测试方法等效的ISO标准。 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。 ====意义和用途====== 5.1 建筑接缝中密封剂成分挥发造成的重量损失可能会因收缩而影响密封剂外观，也可能因功能性密封剂成分的损失而影响密封剂性能。暴露于高- 温度环境会加速挥发物的损失。 5.2 这种测试方法测量体重减轻。它可以与密封剂密度的知识相结合来估计收缩。此外，当与密封剂理论重量固体相比较时，它提供了功能密封剂组分在暴露于高使用温度时可能挥发的程度的估计。这种类型的大量损失可能有助于预测耐久性的早期失效。此外，裂纹或粉化的发展，或两者兼而有之，会缩短密封剂的使用寿命。然而，在这种测试方法中，没有裂纹或粉化或重量损失低的密封剂不一定能保证良好的耐久性。

1.1 This test method covers a laboratory procedure for determining the effects of heat aging on weight loss, cracking, and chalking of cured-in-place elastomeric joint sealants (single- and multi-component) for use in building construction. 1.2 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. 1.3 There is no known ISO equivalent to this test method. 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 ====== 5.1 Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of shrinkage, and sealant performance because of the loss of functional sealant components. Exposure to high-temperature environments will accelerate the loss of volatiles. 5.2 This test method measures weight loss. It can be used in combination with a knowledge of sealant density to estimate shrinkage. In addition, when compared to sealant theoretical weight solids, it provides an estimate of the extent to which functional sealant components can be volatilized when exposed to high service temperatures. Substantial losses of this type may help predict early failures in durability. Also, development of cracks or chalking, or both, lessens sealant service life. However, a sealant that develops no cracks or chalking, or low weight loss in this test method, does not necessarily assure good durability.