1.1 本试验方法涵盖了航空航天前挡风玻璃、雨篷和视口中使用的透明塑料和涂层对灰尘冲击造成的表面侵蚀的耐受性。该测试方法通过独立控制颗粒大小、速度、冲击角、质量负载和测试持续时间，模拟在定义的颗粒云环境中飞行。 1.2 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。 1.3 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====== 5.1 飞机外表面的所有材料都会受到各种尺寸和形状的空气颗粒的磨损。透明材料特别容易磨损，因为其性能取决于其以最小散射量透射光的能力。由于磨损导致的划痕、点蚀、涂层去除和分层可能会增加散射，减少传输，并降低透明材料的性能。飞行员和机组人员的外壳需要视觉透明材料，如雨篷、挡风玻璃和视点。跟踪、瞄准和导航仪器需要红外区（8至12μm）透明材料。 5.2 本试验方法旨在提供一种校准且可重复的方法，用于测定光学和红外透明材料和涂层的材料和涂层的相对耐磨性。 该测试方法的测试参数可直接与现场透明材料暴露的尘云密度和速度相关。

1.1 This test method covers the resistance of transparent plastics and coatings used in aerospace windscreens, canopies, and viewports to surface erosion as a result of dust impingement. This test method simulates flight through a defined particle cloud environment by means of independent control of particle size, velocity, impact angle, mass loading, and test duration. 1.2 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. 1.3 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 ====== 5.1 All materials on exterior aircraft surfaces are subject to abrasion from airborne particles of various sizes and shapes. Transparent materials are particularly vulnerable to abrasion, since their performance is based on their ability to transmit light with a minimal amount of scatter. Scratches, pitting, and coating removal and delamination as a result of abrasion may increase scatter, reduce transmission, and degrade the performance of transparent materials. Visually transparent materials are required for pilot and air crew enclosures, such as canopies, windshields, and viewpoints. Materials transparent in the IR region (8 to 12 μm) are required for tracking, targeting, and navigational instrumentation. 5.2 This test method is intended to provide a calibrated and repeatable means of determining the relative abrasion resistance of materials and coatings for optical and IR transparent materials and coatings. The test parameters for this test method can be directly related to dust cloud densities and velocities to which transparent materials are exposed in the field.