1.1 本规程涵盖使用膜过滤器准备颗粒污染分析的在用液体处理，仅受液体与膜过滤器兼容性的限制。 1.2 本规程涵盖了通过膜过滤器过滤测量体积液体的程序。当使用此方法时，颗粒物将随机分布在过滤器表面，以用于后续的污染分析方法。 1.3 本规程描述了允许处理粒径范围在2 µm和1000 μm，搬运过程中损耗最小。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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《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====== 4.1 本规程规定了液体样品的处理。它将为视觉污染方法（如测试方法）提供最佳的样品处理 F312 .

1.1 This practice covers the processing of in-service fluids in preparation for particulate contamination analysis using membrane filters and is limited only by the liquid-to-membrane filter compatibility. 1.2 The practice covers the procedure for filtering a measured volume of liquid through a membrane filter. When this practice is used, the particulate matter will be randomly distributed on the filter surface for subsequent contamination analysis methods. 1.3 The practice describes procedures to allow handling particles in the size range between 2 µm and 1000 μm with minimum losses during handling. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 4.1 This practice provides for the processing of liquid samples. It will provide the optimum sample processing for visual contamination methods such as Test Methods F312 .