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Reference materials. Guidance for characterization and assessment of homogeneity and stability algolia-search-ignore Who is BS EN 60811-5021 Scope This document explains concepts and provides approaches to the following aspects of the production of reference materials: the assessment of homogeneity; the assessment of stability and the management of the risks associated with possible stability issues related to the properties of interest; the characterization and value assignment of properties of a reference material; the evaluation of uncertainty for certified values; the establishment