1.1 该试验方法包括两个实验室加速暴露程序，用于预测紫外线或紫外线/可见光辐射、热量和水分对溶剂释放密封剂的颜色、垩白、开裂和附着力的影响。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 对本标准具有管辖权的委员会不知道其他组织发布的任何类似标准。 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。 1.5 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 很难在实验室加速风化和自然风化之间建立精确的相关性，因为 （1） 地理气候变化、当地天气与正常情况的变化以及当地污染物 （2） 加速因子与材料有关，随材料类型及其配方而变化。该试验方法用于确定密封剂对实验室加速风化的耐受性，如果使用具有已知户外风化性能的对照材料，则用于确定密封剂相对于对照材料的相对风化性能。 5.2 该试验方法使用铝通道进行。其他基底材料可能显示出不同的结果。

1.1 This test method includes two laboratory accelerated exposure procedures for predicting the effects of ultraviolet or ultraviolet/visible radiation, heat, and moisture on color, chalking, cracking, and adhesion of solvent-release sealants. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations. 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 ====== 5.1 It is difficult to establish a precise correlation between laboratory accelerated and natural weathering because of (1) geographical climatic variations, local weather variation from normal, and local pollutants and (2) the fact that the acceleration factor is material dependent, varying with the type of material as well as its formulation. This test method is used to determine the resistance of a sealant to laboratory accelerated weathering and, if a control material with known outdoor weathering performance is used, the relative weathering performance of the sealant against that of the control material. 5.2 This test method is conducted using aluminum channels. Other substrate materials may show different results.