1.1 本试验方法测量通过炭黑着色乙烯聚合物膜的透光量。 1.2 在计算光量和膜厚度后，计算吸收系数。 1.3 每当以不同单位呈现两组值时，第一组中的值为标准值，而括号中的值仅供参考。 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 用炭黑着色的聚烯烃聚合物的吸收系数有助于判断颜料的分散程度和均匀性，以及颜料添加量的充足性。这些因素用于预测聚合物材料在长时间暴露于紫外线下时的性能，具体性能变化最小。 注1: 本试验方法用于评估用适合紫外线防护的小粒径炭黑着色的乙烯聚合物材料。对于粒径较大（35 nm或更大）的黑色，不知道测试的准确性和再现性如何。然而，对于粒径较大的炭黑，如275℃的炉黑 纳米，当炭黑含量至少为5%或更高时，此类着色材料具有合适的紫外线防护。

1.1 This test method measures the amount of light transmitted through a film of carbon black pigmented ethylene polymer. 1.2 After calculation of the amount of light and film thickness, an absorption coefficient is calculated. 1.3 Whenever two sets of values are presented, in different units, the values in the first set are the standard, while those 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 absorption coefficient of polyolefin polymer pigmented with carbon black is useful to judge the degree and uniformity of dispersion of the pigment, and the adequacy of the quantitative level of pigment addition. These factors are used to predict the performance of the polymer material in response to prolonged exposure to ultraviolet light as evidenced by minimal changes in specific properties. Note 1: This test method was developed to evaluate ethylene polymer materials pigmented with small particle size carbon blacks suitable for UV protection. It is not known how accurate and reproducible the test would be with larger (35 nm or greater) particle size blacks. However, for larger particle sizes of carbon black, such as furnace black at 275 nm, when there is at least 5 or higher percent of carbon black, the material pigmented as such has suitable UV protection.