1.1 本规程描述了根据规程进行的荧光紫外线和冷凝暴露的试验条件和程序 第151页 和 第154页 用于沥青屋面和防水材料。（参见术语 第113页 .) 1.2 以国际单位制或英寸磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不完全相等；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 1.3 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 该风化装置用于将沥青材料的风化特性与已知室外风化特性的对照材料进行比较。无法在加速风化和自然风化之间建立精确的相关性，因为( 1. )存在地理气候变化、当地天气变化和当地污染物变化，以及( 2. )加速风化和自然风化之间的关系取决于材料。不同材料之间以及相同材料配方之间的加速系数不同。 指导 第141页 提供了有关此问题的指导。 注1: 本规程可用于沥青材料以外的其他材料，但尚未评估其重要性和用途。

1.1 This practice describes test conditions and procedures for fluorescent UV and condensation exposures conducted according to Practices G151 and G154 for bituminous roofing and waterproofing materials. (See Terminology G113 .) 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 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. 1.4 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 ====== 4.1 This weathering apparatus is used for comparing the weathering characteristics of bituminous materials against a control material for which the outdoor weathering characteristics are known. It is not possible to establish a precise correlation between accelerated and natural weathering because ( 1 ) there are geographical climatic variations, local weather variations, and variations in local pollutants, and ( 2 ) the relation between accelerated and natural weathering is material dependent. Acceleration factors differ between materials as well as between formulations of the same material. Guide G141 provides guidance regarding this issue. Note 1: This practice can be used for other than bituminous materials, but the significance and use have not been evaluated.