1.1 本标准涵盖了适用于未增强聚烯烃土工膜暴露于荧光紫外线辐射和冷凝的具体程序和测试条件。 注1: 聚烯烃土工膜包括高密度聚乙烯（HDPE）、线性低密度聚乙烯（LLDPE）、柔性聚丙烯（fPP）等。 1.2 在受控环境条件下，将试样暴露于荧光UVA-340灯下。UVA-340灯是该方法的标准。 注2: 根据相关方之间的讨论，也可以使用其他类型的荧光紫外线灯，如UVB-313。但是，如果使用其他类型的荧光紫外线灯（如UVB）进行测试- 313，这应被视为偏离标准，并在测试报告中明确说明。UVB-313和UVA-340荧光灯在不同波长范围内产生不同的辐射功率；因此，这些不同灯具引起的光化学效应可能不同。 1.3 该方法涵盖了进行暴露的条件以及评估荧光紫外线、热量和冷凝水对土工膜影响的试验方法。实践中给出了一般指导 G151页 和 G154页 . 1.4 以国际单位制列出的数值将被视为标准。 1.5 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。 1.6 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 该设备的使用旨在引起与最终使用条件相关的性能变化，包括阳光、水分和热量的紫外线部分的影响。 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。 注3: 参考实践 G151页 适用于实验室风化设备的警示指南。 5.2 当操作条件在该方法的可接受范围内变化时，结果可能会发生变化。 5.3 一种厚度的土工膜的测试数据不能用作使用相同配方（聚合物、颜料和稳定剂）制成的其他厚度的土工膜的数据，因为降解与厚度有关。 注4: 建议将具有已知性能的类似材料（对照品）与试验材料同时暴露，以提供用于比较目的的标准。 当在测试程序中使用对照材料时，建议每个紫外线暴露期仅使用一个试样，以进行OIT测试。

1.1 This standard covers the specific procedures and test conditions that are applicable for exposure of unreinforced polyolefin geomembranes to fluorescent UV radiation and condensation. Note 1: Polyolefin geomembranes include high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), flexible polyproplyene (fPP), etc. 1.2 Test specimens are exposed to fluorescent UVA-340 lamps under controlled environmental conditions. UVA-340 lamps are standard for this method. Note 2: Other types of fluorescent UV lamps, such as UVB-313, can also be used based upon discussion between involved parties. However, if the test is run with another type of fluorescent UV lamp, such as UVB-313, this should be considered as a deviation from the standard and clearly stated in the test report. UVB-313 and UVA-340 fluorescent lamps generate different amounts of radiant power in different wavelength ranges; thus, the photochemical effects caused by these different lamps may vary. 1.3 This method covers the conditions under which the exposure is to be performed and the test methods for evaluating the effects of fluorescent UV, heat, and moisture in the form of condensation on geomembranes. General guidance is given in Practices G151 and G154 . 1.4 The values listed in SI units are to be regarded as the standard. 1.5 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. 1.6 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 use of this apparatus is intended to induce property changes associated with the end-use conditions, including the effects of the UV portion of sunlight, moisture, and heat. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. Note 3: Refer to Practice G151 for cautionary guidance applicable to laboratory weathering devices. 5.2 Variation in results may be expected when operating conditions are varied within the accepted limits of this method. 5.3 Test data for one thickness of a geomembrane cannot be used as data for other thickness geomembranes made with the same formula (polymer, pigment, and stabilizers) since the degradation is thickness related. Note 4: It is recommended that a similar material of known performance (a control) be exposed simultaneously with the test material to provide a standard for comparative purposes. When control material is used in the test program, it is recommended only one coupon be used for each UV exposure period to allow for OIT testing.