本文件规定了适用于液压流体动力系统中使用的滤芯的泡点试验方法。它既可用于验证滤芯的制造完整性（通过检查是否存在气泡），也可用于通过确定第一个泡点来定位滤芯的最大孔隙。 注:制造完整性验证用于确定滤芯的可接受性，以便进一步使用或测试。 通过继续进行制造完整性测试来确定第一个泡点。在任何情况下，这都不是滤芯的功能特性；特别是，它不能用于估计过滤等级、效率或保留能力，仅用于提供信息。 本文件规定了当使用2-丙醇以外的试验流体时，将制造完整性和泡点数据标准化为表面张力标准值的方法。

This document specifies a bubble-point test method applicable to filter elements used in hydraulic fluid power systems. It can be used both to verify the fabrication integrity of a filter element (by checking the absence of bubbles) and to permit the localization of the largest pore of the filter element by determining the first bubble point. NOTE Verification of fabrication integrity is used to define the acceptability of the filter elements for further use or testing. The first bubble point is established through continuation of the fabrication integrity test. It is under no circumstances a functional characteristic of a filter element; in particular, it cannot be used to estimate filtration rating, efficiency or retention capacity and is intended to be used for information only. This document specifies a method to normalise fabrication integrity and bubble point data to a standard value of surface tension when test fluids other than 2-propanol are used.