1.1 任何制造的过滤装置的流动阻力将取决于所用介质的流动阻力。 1.2 本标准提供了足以确定过滤过程中使用的介质扁平试样的气流特性的程序。该方法还扩展到包括褶皱试样和散装介质。 1.3 在所有情况下，通过试样的流速均按照ASME“流体流量计”中概述的程序确定。试验流体为空气。 1.4 本标准可能涉及危险材料、操作和设备。本标准并非旨在解决与其使用相关的所有安全问题。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。 1.5 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《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 过滤器的气流阻力（压降）是一个重要参数，可帮助表征过滤器的物理组成和效用。 5.2 因此，清洁过滤介质的流动特性可用于质量控制、产品开发和基础研究。它可以被过滤介质的生产者用来说明介质类型或满足产品规格，并且可以被消费者用作介质选择的标准。 5.3 这些方法也可用于验收测试。 5.4 出于质量控制、满足产品规范或验收测试的目的，多个样品的单点流动状态是足够的。然而，对于设计、开发和研究，可能需要多点流动机制。

1.1 The flow resistance of any fabricated filter device will depend on the flow resistance of the media used. 1.2 This standard offers procedures sufficient to determine the gas flow characteristics of flat specimens of media used in the filtration process. The methods are extended to include pleated specimens and bulk media as well. 1.3 In all cases, flow rates through the specimen are determined in accordance with procedures outlined in ASME “Fluid Meters.” The test fluid is air. 1.4 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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 ====== 5.1 The air-flow resistance (pressure drop) of a filter is an important parameter that can assist in characterizing the physical make-up as well as the utility of a filter. 5.2 Therefore, flow characteristics of clean filter media can be used for quality control, product development, and basic research. It may be used by the producer of filter media to illustrate media type or to meet product specification and can be used by the consumer as a criterion for media selection. 5.3 These methods may also be used for acceptance testing. 5.4 For purposes of quality control, meeting product specification, or acceptance testing, a single-point flow regime on multiple samples is adequate. However, for design, development, and research, a multiple-point flow regime may be necessary.