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Gas reference materials

Accreditation and international comparability

ISO 17034 and ISO 17025 accreditation

NPL has an extensive scope of accreditation to ISO 17034 (Reference Materials) and ISO 17025 (Calibration) awarded by UKAS (the United Kingdom Accreditation Service).

International comparisons

NPL frequently participates in international comparison exercises with other National Measurement Institutes (NMIs). These comparisons, which are organised by the Consultative Committee for Amount of Substance (CCQM) of the International Committee for Weights and Measures (CIPM), provide a robust framework to demonstrate the global comparability of gas standard mixtures and measurements.

Calibration and Measurement Capabilities

Results of the comparisons operated by the CIPM CCQM are used to compile internationally-recognised Calibration and Measurement Capabilities (CMCs). 

Information regarding international comparisons and NPL's CMCs for gas analysis can be found within the BIPM Key Comparison Database.

CIPM Mutual Recognition Arrangement

Certificates for gas mixtures covered by NPL's CMCs display the logo of the Mutual Recognition Arrangement (MRA) of the CIPM. Certificates containing this logo are mutually recognised by all NMIs who are signatories to the MRA.

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