1.1 本试验方法包括在室外表面和暴露边缘同时施加水且室外表面的快速脉冲空气压力高于室内表面的压力时，测定外窗、天窗和门对水渗透的阻力。 1.2 本试验方法仅适用于窗户、天窗或门。有兴趣测试幕墙快速脉冲气压差的人员应使用AAMA 501.1-94。 1.3 本试验方法解决了制造组件的渗水问题。渗透组件但不会导致此处定义的故障的水可能会对所含材料（如密封剂和绝缘或夹层玻璃）的性能产生不利影响。该测试方法不能解决这些问题。 1.4 正确使用该测试方法需要了解压力测量原理。 1.5 以国际单位制表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该试验方法是测定动态气压差快速循环脉冲期间水渗透阻力的标准程序。 作用在建筑围护结构上的空气压力差变化很大。在指定要使用的试验压差之前，应充分考虑这些因素。 5.2 本试验方法中使用的中间试验压力定义为用户提供的规定试验压力，并与最大正建筑设计压力相关。该试验方法与其他ASTM抗水渗透试验方法的格式不同，该试验方法基于与最大正建筑设计压力相关的最大试验压力。 5.3 随着规定试验压力或中值试验压力的增加，本程序中的最大试验压力也将增加至规范中值试验压力1.5倍。该较高的最大试验压力可能不能代表实际的建筑使用条件。因此，建议的最大中间试验压力为480 Pa（10 psf），相当于720 Pa（15 psf）的最大试验压力。 5.4 该试验方法的脉冲压力可用于泵送水通过具有这些特征的装置的干式密封和通气系统，从而使试验方法比静压试验方法更为严格。另一方面，该试验方法的压力循环的低压部分可允许排水系统和排水坝从具有这些特征的装置中排出水，从而使试验方法比静压试验方法更不严格。 注1: 在应用本试验方法的试验结果时，应注意墙壁或其部件的性能，或两者的性能，可能是正确安装和调整的函数。在使用中，性能还将取决于支撑结构的刚度以及部件对各种原因（振动、热膨胀和收缩等）造成的劣化的抵抗力。 很难准确地模拟实际使用中可能遇到的复杂润湿条件，即大的风吹水滴、随着风速的增加而增加的水滴冲击压力以及侧向或向上移动的空气和水。一些设计比其他设计对这种向上流动的水更敏感。 注2: 本试验未确定可能渗入试样的不可观察液态水。

1.1 This test method covers the determination of the resistance of exterior windows, skylights, and doors to water penetration when water is applied to the outdoor face and exposed edges simultaneously with a rapid pulsed air pressure at the outdoor face higher than the pressure at the indoor face. 1.2 This test method is applicable to windows, skylights, or doors alone. Those interested in testing curtain walls to rapid pulsed air pressure differences should use AAMA 501.1-94. 1.3 This test method addresses water penetration through a manufactured assembly. Water that penetrates the assembly, but does not result in a failure as defined herein, may have adverse effects on the performance of contained materials such as sealants and insulating or laminated glass. This test method does not address these issues. 1.4 The proper use of this test method requires a knowledge of the principles of pressure measurement. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.6 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. 1.7 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 This test method is a standard procedure for determining the resistance to water penetration during rapid cyclic pulses of dynamic air pressure differences. The air-pressure differences acting across a building envelope vary greatly. These factors should be fully considered prior to specifying the test pressure difference to be used. 5.2 The median test pressure used in this test method is defined as the specified test pressure supplied by the user and related to the maximum positive building design pressure. This test method departs from the format of other ASTM water penetration resistance test methods based on a maximum test pressure related to a maximum positive building design pressure. 5.3 As the specified or median test pressure is increased, the maximum test pressure in this procedure is also increased to 1.5 times the specification median test pressure. This higher maximum test pressure may not be representative of actual building service conditions. For this reason the maximum recommended median test pressure is 480 Pa (10 psf), which corresponds to a maximum test pressure of 720 Pa (15 psf). 5.4 The pulsed pressure of this test method may act to pump water past dry seals and breather systems of units incorporating these features, thereby making the test method more severe than a static pressure test method. On the other hand, the low pressure portions of the pressure cycles of this test method may allow weep systems and drainage dams to dissipate water from units incorporating these features, thereby making the test method less severe than a static pressure test method. Note 1: In applying the results of tests by this test method, note that the performance of a wall or its components, or both, may be a function of proper installation and adjustment. In service, the performance will also depend on the rigidity of supporting construction and on the resistance of components to deterioration by various causes, (vibration, thermal expansion and contraction, and so forth). It is difficult to accurately simulate the actual complex wetting conditions that can be encountered in service, with large wind-blown water drops, increasing water drop impact pressures with increasing wind velocity and lateral or upward moving air and water. Some designs are more sensitive than others to this upward moving water. Note 2: This test does not identify unobservable liquid water which may penetrate into the test specimen.