本文件描述了当在所需粒径下无法获得结果时，颗粒浓度和过滤β比率数据插值的推荐方法。它适用于评估与现有流体清洁度和过滤器β比率规范的一致性，其中规范和实际测试结果以不同的粒度单位提供，例如，规范以µm（c）为单位，但颗粒计数或β比率数据以µm（b）为单位。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document describes a recommended method for the interpolation of particle concentration and filter Beta Ratio data when results are not otherwise available at the desired particle sizes. It is applicable for assessing conformance with existing fluid cleanliness and filter Beta Ratio specifications whereby the specification and actual test results are provided in different units of particle size, for example, the specification is in µm(c), but the particle counts or Beta Ratio data are in units of µm(b).All current amendments available at time of purchase are included with the purchase of this document.