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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Chemistry for Gases for United Kingdom (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in mmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
Amount-of-substance fraction in mmol/mol Absolute expanded uncertainty
(k = 2, 95 %) in %
liquefied petroleum gas (LPG); liquefied natural gas (LNG) 1-butene 5.0 to 100 0.8 5.0 to 100 0.8
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 28 June 2018.
Internal NMI service identifier: NPL/GA25
This displays only one part of a multi-component CMC.

United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Chemistry for Gases for United Kingdom (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in mmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
Amount-of-substance fraction in mmol/mol Absolute expanded uncertainty
(k = 2, 95 %) in %
liquefied petroleum gas (LPG); liquefied natural gas (LNG) 1,3-butadiene 4.0 to 20 4.5 4.0 to 20 4.5
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 28 June 2018.
Internal NMI service identifier: NPL/GA25
This displays only one part of a multi-component CMC.

United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Chemistry for Gases for United Kingdom (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in mmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
Amount-of-substance fraction in mmol/mol Absolute expanded uncertainty
(k = 2, 95 %) in %
liquefied petroleum gas (LPG); liquefied natural gas (LNG) i-pentane 4.0 to 20 1.2 4.0 to 20 1.2
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 28 June 2018.
Internal NMI service identifier: NPL/GA25
This displays only one part of a multi-component CMC.

United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Chemistry for Gases for United Kingdom (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in mmol/mol Relative expanded uncertainty
(k = 2, 95 %) in %
Amount-of-substance fraction in mmol/mol Absolute expanded uncertainty
(k = 2, 95 %) in %
liquefied petroleum gas (LPG); liquefied natural gas (LNG) n-pentane 3.0 to 20 2.75 3.0 to 20 2.75
Mechanism(s) for measurement service delivery: PRGM and calibration
Approved on 28 June 2018.
Internal NMI service identifier: NPL/GA25
This displays only one part of a multi-component CMC.