NEW
ISO 33408:2025 - Guidance for the production of pure inorganic substance certified reference materials
Reference materials (RMs) play an important role in measurement processes and support sound, widely recognized measurement systems. ISO 17034 specifies general requirements to be met by reference material producers (RMPs), including for the production of certified reference materials (CRMs). CRMs play a key role in ensuring that measurements are comparable across time and space and are used by laboratories to establish metrological traceability of their measurement results to appropriate references.
This document outlines recommendations, which conform to general requirements of ISO 17034, for production of pure inorganic substance CRMs used to calibrate measuring instruments. These materials primarily comprise inorganic substances. Guidance provided for characterization of pure inorganic chemical materials is also appropriate for those used to prepare pure inorganic substance solution CRMs. This document provides guidance on key aspects of the production of such CRMs, including the assessment of homogeneity and stability. Recommended approaches for characterization and assignment of certified purity values are described.
