ISO 12500-3:2009提供了根据压缩空气系统中使用的过滤器的颗粒大小确定固体颗粒去除效率等级的适当方法选择指南。 ISO 12500-3:2009规定了测试这些过滤器的布局和程序。根据被测过滤器设计用于去除的颗粒物的尺寸范围，推荐测量方法。该测试作为代表一个范围的过滤器的“型式测试”进行。 ISO 12500-3:2009中确定了以下两个粒径范围:细滤器范围0,01<；5.0μm，以及粗过滤范围，≥ 5,0 ≤ 40μm。

ISO 12500-3:2009 provides a guide for choosing an appropriate method of determining the solid particulate removal efficiency rating by particle size of filters used in compressed air systems. ISO 12500-3:2009 specifies the layouts and procedures for testing these filters. Measurement methods are recommended based on the size range of the particulates that the filter being tested has been designed to remove. The test is performed as a “type-test” on filters as being representative of a range. The following two particle diameter size ranges are identified in ISO 12500-3:2009: a fine filter range, 0,01 < 5,0 μm, and a coarse filter range, ≥ 5,0 ≤ 40 μm.