1 Scope
This document explains concepts and provides approaches to the following aspects of
the production of reference materials (RMs):
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— the assessment of homogeneity;
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— the assessment of stability and the management of the risks associated with possible
stability issues related to the properties of interest;
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— the characterization and value assignment of properties of an RM;
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— the evaluation of uncertainty for certified values;
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— the establishment of the metrological traceability of certified values.
The guidance given supports the implementation of ISO 17034. Other approaches can also be used as long as the requirements of ISO 17034 are fulfilled.
Brief guidance on the need for commutability assessment (6.11) is given in this document, but no technical details are provided. A brief introduction
for the characterization of qualitative properties (9.6 to 9.8) is provided, together with brief guidance on sampling such materials for homogeneity
tests (7.4.1.2). However, statistical methods for the assessment of the homogeneity and stability
of RMs for qualitative properties are not covered. This document is also not applicable
to multivariate quantities, such as spectral data.
NOTE
ISO 33406
gives more information on the production of RMs with one or more qualitative property
values.