1.1 这些实践的目的是定义原子氧暴露程序，旨在最大限度地减少任何特定原子氧暴露设施内结果的可变性，并有助于理解在不同设施中测试时材料响应的差异。 1.2 这些做法的目的不是指定任何特定类型的原子氧暴露设施，而是简单地指定可应用于各种设施的程序。 1.3 以国际单位制表示的数值应视为标准。 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====== 3.1 这些实践使以下信息可用: 3.1.1 材料原子氧腐蚀特性。 3.1.2 四种具有良好特征的聚合物的原子氧腐蚀比较。 3.2 结果数据有助于: 3.2.1 比较暴露于低地球轨道环境的航天器材料的原子氧耐久性。 3.2.2 比较各种地面实验室设施之间的原子氧腐蚀行为。 3.2.3 比较地面实验室设施和空间暴露之间的原子氧侵蚀行为。 3.2.4 低地球轨道航天器应用中考虑的屏蔽材料。然而，在尝试预测- 由于暴露环境的差异和协同效应，空间行为基于地面实验室测试。

1.1 The intent of these practices is to define atomic oxygen exposure procedures that are intended to minimize variability in results within any specific atomic oxygen exposure facility as well as contribute to the understanding of the differences in the response of materials when tested in different facilities. 1.2 These practices are not intended to specify any particular type of atomic oxygen exposure facility but simply specify procedures that can be applied to a wide variety of facilities. 1.3 The values stated in SI units are to be regarded as the standard. 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 ====== 3.1 These practices enable the following information to be available: 3.1.1 Material atomic oxygen erosion characteristics. 3.1.2 An atomic oxygen erosion comparison of four well-characterized polymers. 3.2 The resulting data are useful to: 3.2.1 Compare the atomic oxygen durability of spacecraft materials exposed to the low Earth orbital environment. 3.2.2 Compare the atomic oxygen erosion behavior between various ground laboratory facilities. 3.2.3 Compare the atomic oxygen erosion behavior between ground laboratory facilities and in-space exposure. 3.2.4 Screen materials being considered for low Earth orbital spacecraft application. However, caution should be exercised in attempting to predict in-space behavior based on ground laboratory testing because of differences in exposure environment and synergistic effects.