Certified reference materials (CRMs) play a critical role in quality assurance and contribute to the process of establishing traceability of units used to report laboratory results. The use of appropriate CRMs is an important aspect of accreditation to ISO/IEC 17025.
The highest level measurement benchmarks are provided by CRMs. CRMs are a specific class of reference material whose property values (purity, concentration etc) are established and certified in accordance with metrological principles using established, international best practice protocols. CRMs can be pure chemical substances, blends or synthetic mixtures, and spiked or naturally occurring matrices.
CRMs are used to calibrate the measurement process and they all have common characteristics:
Appropriate use of CRMs will help you to assess the accuracy of your analysis and to establish the traceability of test results to national or international standards.
NMI has NATA accreditation for reference material production for chemical reference materials and reference gas mixtures and complies with ISO Guide 34 General Requirements for the Competence of Reference Material Producers.
The following criteria apply to NMI's CRMs which are detailed at the bottom of this page:
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