Reference material (RM)

           Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process

           Certified reference material (CRM)

           Reference material characterized by a metrologically valid procedure for one or more specified properties, accompanied by an RM certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability

          The following ISO standards are currently used in the development of reference materials:

          ISO Guide 30:2015  Reference materials - Selected terms and definitions 

          ISO 33401:2024 Reference materials - Contents of certificates, labels and accompanying documentation

          ISO 33403:2024 Reference materials - Requirements and recommendations for use

          ISO 33405:2024 Reference materials - Approaches for characterization and assessment of homogeneity and stability

          ISO 17034:2016 General requirements for the competence of reference material producers

An Iron Forge

Joseph Wright, 1772