– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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CCM Working Group on Hardness (CCM-WGH)

Terms of reference

    To advise the CCM on matters relating to hardness;

    To improve harmonization of primary standards by developing new primary definitions and/or organizing pilot studies;

    To organize and conduct key and supplementary comparisons for supporting the CIPM MRA;

    To review the results of completed key and supplementary comparisons and plan and support new comparisons;

    To facilitate the submission and review of CMCs by establishing technical review criteria and service categories and providing guidance on and coordinating the review process;

    To support activities of RMOs;

    To produce working documents for the evaluation of uncertainty;

    To maintain good links and interface with the hardness community (IMEKO TC5 - Hardness Measurement;

    To provide formal liaison among organizations involved in the standardization (ISO TC164/SC 3 - Mechanical testing of metals / Hardness testing, ASTM-International Committee E28.06 - Mechanical Testing / Indentation Hardness Testing).


  • Dr Samuel R. Low III  (NIST)


  • Dr Febo Menelao  (PTB)


  • CENAM (Centro Nacional de Metrología)
  • GUM (Central Office of Measures)
  • INMETRO (Instituto Nacional de Metrologia, Qualidade e Tecnologia)
  • INRIM (National Institute of Metrological Research/Istituto Nazionale di Ricerca Metrologica)
  • KEBS (Kenya Bureau of Standards)
  • KRISS (Korea Research Institute of Standards and Science)
  • LNE (Laboratoire National de Métrologie et d'Essais)
  • NIM (National Institute of Metrology)
  • NIMT (National Institute of Metrology (Thailand))
  • NIST (National Institute of Standards and Technology, United States Department of Commerce)
  • NMIJ/AIST (National Metrology Institute of Japan, AIST)
  • NMISA (National Metrology Institute of South Africa)
  • NPL (National Physical Laboratory)
  • PTB (Physikalisch-Technische Bundesanstalt)
  • RISE (RISE Research Institutes of Sweden AB)
  • SMU (Slovak Institute of Metrology/Slovenský Metrologický Ústav)
  • UME (National Metrology Institute of Turkey/TÜBITAK Ulusal Metroloji Enstitüsü)
  • VNIIFTRI (All-Russian Scientific Research Institute of Physical Technical Measurements, Rosstandart)
  • VNIIM (D.I. Mendeleyev Institute for Metrology, Rosstandart)
  • VSL (VSL Dutch Metrology Institute)
  • RMO Technical Committee chairs in the field of Mass and Related Quantities or their representatives

  CCM: Upcoming meetings
17–21 May 2021: 18th meeting of the CCM and related meetings

CCM summary
General information
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CCM Guidelines on final reports of comparisons
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CCM-WGH documents
CCM-WGPV documents
Workshop on the mise en pratique (Nov. 2012)