1.1 本规程仅限于操作氙弧灯和水设备的基本原理和程序；就其本身而言，它并没有产生具体的结果。 1.2 它旨在与定义应用的特定暴露条件以及评估材料特性变化的方法的实践或方法结合使用。本规程旨在再现材料在实际使用中暴露于阳光（直接或通过窗户玻璃）和湿气（如湿度、雨水或露水）时产生的风化效应。 本规程仅限于获取、测量和控制暴露条件的程序。 注1: 附录中列出了许多暴露程序；然而，本规程并未规定最适合待测材料的暴露条件。 注2: 实践 G151页 描述在使用实验室光源的设备中暴露材料时使用的一般程序和性能要求。 1.3 在受控环境条件下，将试样暴露于光学过滤氙弧灯的光下。 描述了与氙弧光源组合的不同类型的光学滤波器。 1.4 ASTM方法或特定材料规范涵盖了样本制备和结果评估。在实践中给出了一般指导 G151页 . 注3: 实践中描述了确定暴露后性质变化和报告这些结果的方法的一般信息 D5870 . 1.5 本规程不适用于裸金属的腐蚀试验。 1.6 单位- 以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.7 本规程在技术上类似于以下ISO文件:ISO 4892-2、ISO 16474-2、ISO 105-B02、ISO 105-B04、ISO 105-B05、ISO 105-B06和ISO 105-B10。 1.8 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。 1.8.1 如果在灯具操作过程中产生任何臭氧，则应通过排气系统将其从试样和操作人员身上带走。 1.9 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====== 5.1 该仪器将样本暴露于光、热和可选湿度下，通常试图复制在室外和室内最终使用环境中观察到的样本特性变化。暴露不是为了模拟局部天气现象引起的恶化，例如大气污染、生物攻击和盐水暴露。 5.2 这种做法允许广泛的暴露条件，可能产生显著不同的结果。因此，除非附有符合第节要求的报告，否则不得参考其使用结果 10 详细说明具体操作条件。 5.2.1 对照品（具有已知性能的类似材料）应与试样同时暴露，以提供比较参考。最佳做法是使用两种不同的控制材料:一种已知耐久性较差，另一种已知耐久性较好。 应同时暴露每个试样和对照材料的至少三个副本，以便对结果进行统计评估。 5.3 除非在待测材料的仪器之间建立了再现性，否则不应使用相同的设定值和操作控制对暴露在不同仪器（即使仪器是同一型号）中的样品进行结果比较。 5.4 参考实践 G151页 适用于所有实验室风化仪的警示指南。 5.5 建议用户遵循良好的实验室实践，以减少暴露的可变性( 1 ). 8

1.1 This practice is limited to the basic principles and procedures for operating a xenon arc lamp and water apparatus; on its own, it does not deliver a specific result. 1.2 It is intended to be used in conjunction with a practice or method that defines specific exposure conditions for an application along with a means to evaluate changes in material properties. This practice is intended to reproduce the weathering effects that occur when materials are exposed to sunlight (either direct or through window glass) and moisture as humidity, rain, or dew in actual use. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. Note 1: A number of exposure procedures are listed in an appendix; however, this practice does not specify the exposure conditions best suited for the material to be tested. Note 2: Practice G151 describes general procedures and performance requirements to be used when exposing materials in an apparatus that uses laboratory light sources. 1.3 Test specimens are exposed to light from an optically-filtered xenon arc lamp under controlled environmental conditions. Different types of optical filters in combination with xenon arc light sources are described. 1.4 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151 . Note 3: General information about methods for determining the change in properties after exposure and reporting these results is described in Practice D5870 . 1.5 This practice is not intended for corrosion testing of bare metals. 1.6 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 This practice is technically similar to the following ISO documents: ISO 4892-2, ISO 16474-2, ISO 105-B02, ISO 105-B04, ISO 105-B05, ISO 105-B06, and ISO 105-B10. 1.8 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. 1.8.1 Should any ozone be generated from the operation of the lamp(s), it shall be carried away from the test specimens and operating personnel by an exhaust system. 1.9 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 The apparatus exposes specimens to light, heat, and optionally moisture, often to attempt to replicate specimen property changes observed in outdoor and indoor end-use environments. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. 5.2 This practice allows a wide range of exposure conditions that may produce significantly different results. Therefore, no reference shall be made to results from its use unless accompanied by a report in conformance with Section 10 detailing the specific operating conditions. 5.2.1 A control (a similar material of known performance) should be exposed simultaneously with the test specimen to provide a reference for comparative purposes. It is best practice to use two different control materials: one known to have relatively poor durability and one known to have relatively good durability. At least three replicates of each test specimen and control material should be exposed concurrently to permit statistical evaluation of results. 5.3 Comparison of results obtained from specimens exposed in different apparatus (even if the apparatus is the same model) using the identical setpoints and operational controls should not be made unless reproducibility has been established between apparatus for the material to be tested. 5.4 Refer to Practice G151 for cautionary guidance applicable to all laboratory weathering apparatus. 5.5 It is recommended that users follow good laboratory practices in order to reduce variability in exposures ( 1 ). 8