本文件旨在支持用于粒度分析的标准物质（RMs）用户，以确定适合其需求的RMs（认证或未认证）。根据对用户的关注，超出用户收到的样品制备范围的样品制备问题将不包含在本文件中。 本文件描述了RMs（经认证或未经认证）在确定粒径时应满足的基本要求，以适合特定用途。本文件仅限于对基本原则的描述——讨论某个数值是否适用于目的超出了本文件的范围。 本文件的范围仅限于颗粒形式的RMs（经认证或未经认证）。本文件不涉及任何其他形式的RMs，如校准网格。

This document is intended to support users of reference materials (RMs) for particle size analysis to identify suitable RMs (certified or not) for their needs. In line with the focus on users, questions on sample preparation that go beyond preparation of the sample as received by the user will not be covered by this document. This document describes the fundamental requirements that RMs (certified or not) for the determination of particle size shall fulfil in order to be fit for a given purpose. The document is limited to a description of the fundamental principles – the discussion whether a certain numerical value is fit for purpose is beyond the scope of this document. The scope of this document is limited to RMs (certified or not) in the form of particles. This document does not deal with any other form of RMs, like calibration grids.