1.1 本试验方法涵盖了评估白色或浅色硫化橡胶的表面变色的技术，当在相对湿度或湿度和温度的受控条件下从指定来源受到紫外线或紫外线/可见光照射时，可能会发生这种变色。 1.2 本试验方法还描述了如何定性评估在此类条件下产生的变色程度。 1.3 术语“变色”适用于橡胶样品的颜色变化，区别于染色（参见 注1 )，即与橡胶试样接触或相邻的金属表面的颜色变化。 注1: 染色测试包含在测试方法中 D925 . 1.4 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。 1.5 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====== 4.1 白色或浅色的表面- 有色硫化橡胶制品或覆盖有机面漆的硫化橡胶在暴露于潮湿、潮湿、高温和阳光下时可能会变色。浅色橡胶表面的这种颜色变化令消费者反感。 4.2 所获得的结果应仅被视为指示来自指定光源（UVA-340灯或带有日光滤光片的氙弧）的辐照度的影响，而不是等同于任何自然暴露的结果，除非已根据经验确定了相关材料的定量关联程度。 4.3 本试验方法可用于生产者-消费者验收、仲裁目的以及研发工作。

1.1 This test method covers techniques to evaluate the surface discoloration of white or light-colored vulcanized rubber that may occur when subjected to UV or UV/visible exposure from specified sources under controlled conditions of relative humidity, or moisture, and temperature. 1.2 This test method also describes how to qualitatively evaluate the degree of discoloration produced under such conditions. 1.3 The term “discoloration” applies to a color change of the rubber sample, as distinguished from staining (see Note 1 ), that refers to a color change of a metal finish in contact with or adjacent to the rubber specimen. Note 1: Tests for staining are covered by Test Methods D925 . 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 ====== 4.1 The surface of white or light-colored vulcanized rubber articles, or vulcanized rubber covered with an organic finish, may discolor when exposed to conditions of humidity, or moisture, heat, and sunlight. This change in color of light-colored rubber surfaces is objectionable to the consumer. 4.2 Results obtained should be treated only as indicating the effect of irradiance from the specified source (either UVA-340 lamps or a xenon arc with a Daylight Filter) and not as equivalent to the result of any natural exposure, unless the degree of quantitative correlation has been empirically established for the material in question. 4.3 This test method may be used for producer-consumer acceptance, referee purposes, and research and development work.