1.1 该试验方法建立了使用单分散气溶胶测量材料初始颗粒过滤效率的程序。 1.1.1 该测试方法利用0.1至5.0μm尺寸范围内的光散射颗粒计数和0.5至25 cm/s的气流测试速度。 1.2 测试程序通过比较进料流（上游）中的颗粒计数与滤液（下游）中的粒子计数来测量过滤效率。 1.3 以国际单位制或其他单位表示的数值应单独视为标准。每个系统中规定的值必须独立使用，不得以任何方式组合值。 1.4 以下注意事项仅适用于试验方法部分，第节 10 。 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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该试验方法通过在受控气流室中对上游和下游乳胶气溶胶浓度的代表性体积进行采样来测量材料的初始过滤效率。 5.2 该测试方法为制造商和用户提供了特定的测试技术，以评估暴露在0.1至5.0μm气溶胶颗粒中的材料。 5.2.1 该试验方法为材料之间的效率比较奠定了基础。

1.1 This test method establishes procedures for measuring the initial particle filtration efficiency of materials using monodispersed aerosols. 1.1.1 This test method utilizes light-scattering particle counting in the size range of 0.1 to 5.0 μm and airflow test velocities of 0.5 to 25 cm/s. 1.2 The test procedure measures filtration efficiency by comparing the particle count in the feed stream (upstream) to that in the filtrate (downstream). 1.3 The values stated in SI units or in other units shall be regarded separately as standard. The values stated in each system must be used independently of the other, without combining values in any way. 1.4 The following precautionary caveat pertains only to the test methods portion, Section 10 , of this specification. 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 ====== 5.1 This test method measures the initial filtration efficiency of materials by sampling representative volumes of the upstream and downstream latex aerosol concentrations in a controlled airflow chamber. 5.2 This test method provides specific test techniques for both manufacturers and users to evaluate materials when exposed to aerosol particle sizes between 0.1 and 5.0 μm. 5.2.1 This test method establishes a basis of efficiency comparison between materials.