1.1 本试验方法包括根据通过0.8的质量流量测量确定润滑剂和液压液的湿过滤性 在水存在下老化流体后的µm膜。本程序适用于使用美国石油学会（API）I、II、III、IV组和某些V基料配制的润滑剂和液压油。使用水或比水重的基础油配制的产品不在范围内。 1.2 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。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.4 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====== 5.1 精密设备和高压液压机械需要经过过滤的润滑剂和液体，以防止硬颗粒污染物循环造成的损坏。润滑剂和液压液中存在三种类型的颗粒污染物:机械装配过程中的内置污染物、设备磨损产生的污染物和从外部进入的污染物。水也可以通过加注口、有缺陷的密封件、腐蚀的热交换器和储罐呼吸器以雨水、清洗液、工艺用水、金属加工液、冷却剂和潮湿空气的形式进入机械润滑和液压系统。 5.2 润滑油和液压油在有水分的情况下保持其可过滤性的能力对于高效可靠的机器性能至关重要。通常，过滤器上的压差会随着污垢、污泥和磨损碎屑的积聚而逐渐增大。为了防止过滤器坍塌，当压差过高时，过滤器组件中的旁通阀打开。如果过滤器被因存在污染水而沉淀的添加剂堵塞，旁通阀将打开。这可能导致机器停机或破坏性颗粒在机器中循环。

1.1 This test method covers determination of the wet filterability of lubricants and hydraulic fluids based upon mass flow rate measurements through a 0.8 µm membrane after ageing of the fluid in the presence of water. The procedure applies to lubricants and hydraulic fluids that are formulated with American Petroleum Institute (API) Group I, II, III, IV and certain V base stocks. Products formulated with water or base stocks that are heavier than water are out of scope. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 Precision equipment and high pressure hydraulic machinery require filtered lubricants and fluids to prevent damage from the circulation of hard particulate contaminants. Three types of particulate contaminants are present in lubricants and hydraulic fluids: built in contaminants from the machinery assembly process, generated contaminants from equipment wear, and contaminants that enter from external sources. Water can also enter machinery lubrication and hydraulic systems through fill ports, defective seals, corroded heat exchangers, and reservoir breathers in the form of rain water, cleaning solutions, process water, metalworking fluids, coolants, and humid air. 5.2 The ability of lubricants and hydraulic fluids to retain their filterability in the presence of moisture is critical for efficient and reliable machine performance. Normally, the pressure differential across a filter will increase gradually as it accumulates dirt, sludge, and wear debris. In order to prevent the filter from collapsing, bypass valves in the filter assembly open when the differential pressure gets too high. If a filter becomes blocked by additives that precipitate due to the presence of contaminating water, the bypass valve will open. This can lead to a machine shutdown or circulation of damaging particles throughout the machine.