1.1 本实施规程涵盖了适用于使用荧光紫外线灯和水仪器的特定程序和测试条件，这些程序和测试条件是按照实施规程进行的塑料暴露 G151页 和 G154页 . 本规程还包括试样的制备、最适合塑料的试验条件以及试验结果的评估。 1.2 以国际单位制表示的数值应视为标准值。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、健康和环境实践，并确定监管限制的适用性。 注1: 本标准和ISO 4892-3涉及相同的主题，但在技术联系方面有所不同。 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《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====== 4.1 塑料材料抵抗因暴露于光、热和水而引起的劣化的能力在许多应用中具有重要意义。本规程旨在引起与最终使用条件相关的性能变化，包括紫外线太阳辐照度、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。( 警告- 在本规程可接受范围内的操作条件变化不一定会提供相同的结果。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 8. 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: 关于可变性来源以及解决实验室设计、执行和数据分析中可变性的策略的附加信息- 加速暴露试验见指南 G141页 . 4.2 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。 5. , 6. 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。 4.3 测试结果将取决于按照惯例操作设备时的谨慎程度 G154页 . 重要因素包括线路电压的调节、设备运行所在房间的温度、温度控制以及灯具的状况和寿命。

1.1 This practice covers specific procedures and test conditions that are applicable for using a fluorescent UV lamp and water apparatus exposure of plastics conducted in accordance with Practices G151 and G154 . This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results. 1.2 The values stated in 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: This standard and ISO 4892-3 address the same subject matter, but differ in technical contact. 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 The ability of a plastic material to resist deterioration caused by exposure to light, heat, and water is a property of significance in many applications. This practice is intended to induce property changes associated with end-use conditions, including the effects of ultraviolet solar irradiance, 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 saltwater exposure. ( Warning— Variation in operating conditions within the accepted limits of this practice will not necessarily provide the same results. Therefore, no reference to the use of this practice shall be made unless accompanied by a report prepared in accordance with Section 8 that describes the specific operating conditions used. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained in accordance with 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 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. 5 , 6 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. 4.3 Test results will depend upon the care that is taken to operate the equipment in accordance with 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 lamp.