1.1 本实施规程描述了根据实施规程使用荧光紫外线灯和水设备测试涂层和相关产品耐久性的人工加速风化方法 G151 和 G154 。 1.2 本规程还对试样的制备、暴露时间和试验结果的评估提出了建议。 注1: ISO 16474-3还描述了用于涂料和涂层的人工加速风化的荧光紫外灯和水设备。 1.3 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。 1.4 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====== 4.1 涂料或涂层抵抗因暴露于光、热和水而导致的物理和光学性能退化的能力在许多应用中都很重要。本规程描述了人工加速风化方法，旨在重现最终使用条件下暴露在阳光、湿气和热量下的特性变化。本实践中引用的风化方法无法模拟局部天气现象（如大气污染、生物攻击和盐水暴露）造成的恶化。 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，否则不得提及本规程的使用 10 其描述了所使用的具体操作条件。参考实践 G151 有关适用于使用根据本惯例获得的结果的注意事项的详细信息。 注2: 关于实验室加速暴露试验的设计、执行和数据分析中变异性来源和应对变异性策略的更多信息，请参阅指南 G141 。 4.2.1 来自荧光紫外线灯的光的光谱辐照度与使用其他光源的光和水暴露设备中产生的光谱辐照度显著不同。 暴露在荧光紫外线灯下产生的降解类型和速率以及性能等级可能与暴露在其他类型的实验室光源下产生的退化类型和速率大不相同。 4.2.2 只有当所有实验室使用相同设计的仪器、灯具和暴露条件时，实验室间比较才有效。 4.3 当根据与其他材料或对照材料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（对照品）。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 试验结果的重复性和再现性将取决于根据实践操作设备时所采取的注意事项 G154 重要因素包括线路电压的调节、设备运行房间的温度、温度控制以及灯的状况和使用年限。 4.5 根据本规范对人工加速风化的所有参考应包括对试验循环和设备的完整描述 习惯于

1.1 This practice describes artificial accelerated weathering methods for testing the durability of coatings and related products using fluorescent UV lamps and water apparatus operated in accordance with Practices G151 and G154 . 1.2 This practice also makes recommendations for preparation of test specimens, exposure duration, and the evaluation of test results. Note 1: ISO 16474-3 also describes fluorescent UV lamp and water apparatus for artificial accelerated weathering of paints and coatings. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 ====== 4.1 The ability of a paint or coating to resist degradation of its physical and optical properties caused by exposure to light, heat, and water can be important for many applications. This practice describes artificial accelerated weathering methods designed to reproduce property changes associated with exposure to sunlight, moisture, and heat in end-use conditions. The weathering methods referenced in this practice do not simulate the deterioration caused by localized weather phenomena such as atmospheric pollution, biological attack, and saltwater exposure. 4.2 Cautions — 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 10 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 irradiance of light from fluorescent UV lamps is significantly different from that produced in light and water exposure devices using other light sources. The type and rate of degradation and the performance rankings produced in exposures to fluorescent UV lamps 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 design of apparatus, lamp, 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 material. 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 Repeatability and reproducibility of test results will depend upon the care that is taken to operate the equipment according to Practice G154 . Significant factors include regulation of line voltage, temperature of the room in which the device operates, temperature control, and condition and age of the lamps. 4.5 All references to artificial accelerated weathering in accordance with this practice shall include a complete description of the test cycle and equipment used.