1.1 本规程涵盖了从实践中选择试验条件 G53型 用于抛光涂料、相关涂料和材料的暴露试验。本规程涵盖了使用荧光紫外线（UV）和冷凝装置模拟阳光和水（如雨或露水）引起的劣化的基本原理和操作程序。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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。 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====== 3.1 外部暴露的有机涂层会受到天气退化因素的侵蚀，特别是紫外线、氧气和水。本规程可用于评估应用于涂层的抛光膜的保护性能。然后将该抛光涂层暴露在产生紫外线辐射、温度变化和水凝结的设备中一段给定时间。 3.2 任何单次曝光装置，无论是否含水，都不能指定为直接模拟自然曝光。这种做法并不意味着与室外暴露有特定的相关性。然而，它在筛选测试参数范围内的抛光剂的相对保护质量时很有用。

1.1 This practice covers the selection of test conditions from Practice G53 to be employed for exposure testing of polish-coated paint, related coatings, and materials. This practice covers the basic principles and operating procedures for using fluorescent ultraviolet (UV) and condensation apparatus to simulate the deterioration caused by sunlight and water as rain or dew. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. 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 ====== 3.1 Organic coatings on exterior exposure are subjected to attack by degrading elements of the weather, particularly ultraviolet light, oxygen, and water. This practice may be used for evaluating the protective behavior of polish film applied to a coating. This polish-coated coating is then exposed in an apparatus that produces ultraviolet radiation, temperature variation, and water condensation for a given time period. 3.2 No single light exposure apparatus, with or without water, can be specified as a direct simulation of natural exposure. This practice does not imply a specific correlation with outdoor exposure. It is, however, useful in screening the relative protective qualities of a polish within the test parameter.