1.1 本规程涵盖了将压敏胶带暴露于加速室外风化环境的一个程序。 1.2 本规程描述了样品制备及其应暴露的加速室外环境。它没有规定在暴露后对材料进行哪些观察或测试。 1.3 以英寸-磅为单位的数值应视为标准值。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。 1.5 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 本规程提供了一种定性评估室外风化对压敏胶带影响的方法。胶带的室外耐候性是相对于具有已知稳定性的控制胶带的电阻来确定的。 4.2 如果本规程中描述的试验产生的降解类型与实时暴露在相同材料中发现的降解类型相同，则可以使用这些短期试验的结果来确定自然风化的定量影响。 4.3 使用紫外线太阳辐射暴露水平（MJ/m）进行暴露试验的时间安排，包括本规程的室外常规暴露和室外加速暴露 2. )紫外线（295至385 nm）的测量是暴露测试时间的改进。 测试太阳辐射暴露的特定水平（MJ/m 2. )可用于确定相对等效暴露，但使用（MJ/m 2. UV（295至385 nm））是首选方法。 4. , 5. , 6. 4.4 辐射暴露（308或616MJ/m 2. )在该实践中，西南部和佛罗里达州的暴露分别约为一年和两年。由于所有材料在不同的环境中以不同的速率“风化”，因此，在确定在其使用环境中测试的材料的定量相关性之前，使用本规程获得的结果不应表示为等同于自然风化。 注1: 自然日照的紫外线含量在定性和定量上都与时间有关。因此，冬季测试需要更长的Flesnel暴露时间- 反射器试验机，用于实现相同的紫外线能量沉积和与夏季试验同时出现的定量同等降解水平。

1.1 This practice covers one procedure for the exposure of pressure-sensitive tapes to an accelerated outdoor weathering environment. 1.2 This practice describes sample preparation and an accelerated outdoor environment to which it shall be exposed. It does not specify what observations or tests are to be performed on the material following exposure. 1.3 The values stated in inch-pound 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 This practice provides a means of qualitative assessments of outdoor weathering effects on pressure-sensitive tapes. The resistance of tapes to outdoor weathering is determined relative to the resistance of a control tape with known stability. 4.2 If tests described in this practice produce the same type of degradation as found in real-time exposures of the same materials, it is possible to use the results from these short-term tests to determine the quantitative effects of natural weathering. 4.3 The timing of exposure testing covering both outdoor conventional and outdoor accelerated exposure of this practice, using levels of ultraviolet solar radiation exposure (MJ/m 2 ) of UV (295 to 385 nm) is an improvement in the timing of exposure testing. Testing specific levels of solar radiant exposure (MJ/m 2 ) may be used to establish relative equivalent exposure, but the use of (MJ/m 2 of UV (295 to 385 nm)) is the preferred method. 4 , 5 , 6 4.4 The radiant exposure (308 or 616 MJ/m 2 ) suggested in this practice approximates one and two years, respectively, of exposure in the Southwest and Florida. Since all materials “weather” at different rates in different environments, results obtained using this practice should not be represented as equivalent to natural weathering until the degree of quantitative correlation has been established for the material tested in the environment of its use. Note 1: The ultraviolet content of natural sunshine is time-of-year dependent, both qualitatively and quantitatively. Thus, wintertime testing requires longer exposure periods on the Flesnel-reflector test machines described to achieve equal ultraviolet energy deposition and a quantitative equal level of degradation concomitant with summertime testing.