• Certified Reference Materials from CAC GAS

Measurement and Testing

Certified Reference Materials from CAC GAS

Jul 18 2023

CAC Gas offers a wide range of certified reference materials including specialty gas mixtures, liquids, and liquefied gas standards.

Curated from several industry leading manufacturers, only mixtures that meet CAC’s high standard for quality are supplied to meet the needs of an ever-evolving landscape of analytical applications.

CAC GAS’s range of gases and liquids are available in a wide array of cylinders, bottles, and ampoules.

Specialty Gases:

We produce simple binary mixtures through to complex multi-component gas mixtures in a range of cylinders sizes.  CAC GAS offers non-refillable (low volume) cylinders and high pressure (large volume) cylinders and low-pressure cylinders. All valve types are available including AS, BS, CGA and DIN as required.

Liquefied Gases:

Liquefied gas mixtures are available in a range of different cylinders including constant pressure (CPC) and standard gas cylinders fitted with dip tube valves.

Liquefied gas mixtures are used where the application demands calibration with ‘heavy’ or longer-chain hydrocarbons. Liquid mixtures have the advantage of closely matching the product being analysed, while also offering increased efficiency by allowing an increased number of calibrations with the same cylinder, when compared to a gaseous mixture.


A wide variety of ASTM compliant and ISO17034 liquid standards are available in bottles and ampoules. These standards are gravimetrically prepared and N.I.S.T. Traceable by weight with the gravimetric values verified by one or more analytical methods.  

Available in 1 mL, 2 mL, 5 mL, 10 mL, 20 mL, 50 mL, 100 mL, 200 mL, 500 mL , and 1 liter sizes.

All certified reference materials supplied by CAC Gas are manufactured using traceable weights and measures before being analysed or tested by specific, documented methods, and come with a certificate stating the method(s) used.

These methods exist to promote similar product quality and properties for a single product type from various manufacturers, or to ensure a minimum product quality. Methods may be nationally or internationally recognized, such as those from ASTM, ISO, or US EPA.

Traceability is demonstrated by an unbroken chain of measurements or calibrations all the way to the accepted international primary reference materials. This means the calibration of the instrumentation involved throughout the manufacturing process (scales/balances, mass flow controllers, pressure gauges, etc.) be ISO17025 certified. Calibration certificates for relative instruments are kept on file and referred to on the mixture certificate if required.

To meet the most stringent of customer requirements some mixtures will have been produced or calibrated within the scope of an ISO17034 or ISO17025 accredited organisation whose accreditation is recognised under the ILAC MRA, so they are accepted globally*.

Accreditation proves the producer’s technical capability in measurement, and stated traceability to SI units, having been thoroughly assessed by the relevant national testing authority.

These mixtures meet the requirements of:

  • ISO/IEC17025:2017
  • ISO Guide 30:2015 (Clause 2.1.1 or 2.1.2)
  • AS2290:2018

*For more information, read our blog on understanding units of measurement for specialty gas mixtures or determining accuracy of a calibration gas mixture.

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