1.1 本规程涵盖了根据规程进行的氙弧装置中涂层和相关产品加速暴露试验的试验条件选择 G151页 和 G155页 . 本规程还包括试样的制备、适用于涂层的试验条件以及试验结果的评估。 注1: 本规程和ISO 16474-2涉及相同的主题，但技术内容不同。 1.2 国际单位制数值应视为标准值。括号中给出的值仅供参考。 1.3 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1 涂料或涂层抵抗因暴露于光、热和水而引起的物理和光学性能劣化的能力在许多应用中都非常重要。本规程旨在引起与最终使用条件相关的性能变化，包括日光、水分和热量的影响。本实践中使用的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。 4.2 注意事项- 当使用不同的操作条件时，结果可能会发生变化。因此，除非附有根据第节编制的报告，否则不得提及本惯例的使用 9 这描述了使用的特定操作条件。参考实践 G151页 有关适用于使用根据本规程获得的结果的注意事项的详细信息。 注2: 指南中提供了关于可变性来源以及解决实验室加速暴露试验设计、执行和数据分析中可变性的策略的更多信息 G141页 . 4.2.1 氙弧发出的光的光谱功率分布与使用碳弧或其他光源的光和水暴露装置中产生的光谱功率分布有显著不同。暴露于氙弧产生的退化类型和速率以及性能排名可能与暴露于其他类型的实验室光源产生的退化类型和速率以及性能排名大不相同。 4.2.2 只有当所有实验室使用相同的光源、滤光片类型和暴露条件时，实验室间比较才有效。 4.3 当根据与其他材料或对照物相比的性能等级来评估材料的稳定性时，实验室之间测试结果的再现性已被证明是良好的。 6. , 7. 因此，强烈建议在试验材料的同时暴露具有已知性能的类似材料（对照）。建议每种材料至少暴露三次，以便对结果进行统计评估。 4.4 测试结果将取决于根据实践操作设备的谨慎程度 G155页 . 重要因素包括线路电压的调节、无盐或其他水沉积物、温度和湿度控制以及灯具和过滤器的状况和使用寿命。 4.5 根据本规程对暴露的所有参考必须包括对所用试验循环的完整描述。

1.1 This practice covers the selection of test conditions for accelerated exposure testing of coatings and related products in xenon arc devices conducted according to Practices G151 and G155 . This practice also covers the preparation of test specimens, the test conditions suited for coatings, and the evaluation of test results. Note 1: This practice and ISO 16474-2 address the same subject matter but differ in technical content. 1.2 The values SI units are to be regarded as standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 4.1 The ability of a paint or coating to resist deterioration of its physical and optical properties caused by exposure to light, heat, and water can be very significant for many applications. This practice is intended to induce property changes associated with end use conditions, including the effects of daylight, moisture, and heat. The exposure used in this practice is not intended to simulate the deterioration caused by localized weather phenomena such as atmospheric pollution, biological attack, and salt water exposure. 4.2 Caution— Variation in results may be expected when different operating conditions are used. Therefore, no reference to the use of this practice shall be made unless accompanied by a report prepared according to Section 9 that describes the specific operating conditions used. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to this practice. Note 2: Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of laboratory accelerated exposure tests is found in Guide G141 . 4.2.1 The spectral power distribution of light from a xenon-arc is significantly different from that produced in light and water exposure devices using carbon-arc or other light sources. The type and rate of degradation and the performance rankings produced by exposures to xenon-arcs can be much different from those produced by exposures to other types of laboratory light sources. 4.2.2 Interlaboratory comparisons are valid only when all laboratories use the same light source, filter type, and exposure conditions. 4.3 Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control. 6 , 7 Therefore, exposure of a similar material of known performance (a control) at the same time as the test materials is strongly recommended. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. 4.4 Test results will depend upon the care that is taken to operate the equipment according to Practice G155 . Significant factors include regulation of line voltage, freedom from salts or other deposits from water, temperature and humidity control, and condition and age of the lamp and filters. 4.5 All references to exposures in accordance with this practice must include a complete description of the test cycle used.