意义及用途
5.1 This test method is designed to induce color changes in sealants and their component pigments related to the conditions of end use, 包括阳光的影响, 湿气和热量. The exposures used in this test method are not intended to simulate color changes in sealants caused by local weathering phenomena, 比如大气污染, 生物攻击, and saline exposure.

5.2 在使用实验室光源的设备中进行曝光时, it is important to consider how the manual test conditions will reproduce the performance variations and failure modes associated with the final use environment of the sealant under test. Information on the use and interpretation of accelerated exposure test data is provided in Practice G151.

5.3 When this test method is used as part of the specification, the exact procedure, 测试条件, test duration and evaluation techniques need to be specified. Due to the different spectral power distribution of the light sources (fluorescent ultraviolet and xenon arc), the results obtained between the two procedures may differ. Sealants should not be compared to each other based on results obtained in different types of equipment.

5.4 These devices are well matched to ultraviolet solar radiation. 然而, for sealants that are sensitive to long wavelength ultraviolet and visible solar radiation, the absence of such radiation in fluorescent ultraviolet devices will distort the color stability ranking compared to external environmental exposure.

笔记 1: For a complete cautionary guide on laboratory ageing of non-metallic materials, 参见练习 G151.

ASTM C1501-2019 通过实验室加速老化程序评估建筑结构密封胶色牢度的标准测试方法

半径
1.1 This test method describes laboratory accelerated aging procedures for the determination of color stability of building construction sealants using fluorescent ultraviolet or xenon arc test devices.

1.2 The color stability rankings provided by these two programs may not be consistent.

1.3 以 SI 单位表示的值应被视为标准值. 括号内的数值仅供参考.

1.4 There is no equivalent ISO standard for this test method.

1.5 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 本标准的使用者有责任建立适当的安全机制, 健康和环境实践，并在使用前确定监管限制的适用性.

1.6 本国际标准基于《关于制定国际标准的原则的决定》中确立的国际公认的标准化原则, 世界贸易组织贸易技术壁垒委员会发布的指南和建议.