How can GBW standard certificates ensure the reliability of standard gas values?

GBW is a pinyin abbreviation for national reference materials. It is a certified standard substance approved and evaluated by the State Administration for Market Regulation. GBW is the technical capability of a nationally recognized standard material production facility. Having a standard substance with this certificate means that its quantity is accurate and reliable. China's national standard substances are divided into primary and secondary levels. The first level is mainly developed by the China Institute of Metrology, while the second level is developed by companies or institutions with certain production and analysis capabilities. When applying for the GBW certificate, the developed standard materials are first drafted in the form of a written report and submitted to the National Standard Materials Management Committee. The committee shall organize experts to conduct technical review of the application documents and provide corrective opinions. Once the corrective measures are passed, the management committee shall submit them to the State Administration for approval. The entire process of applying for a technical classification certificate usually takes 2-3 years.

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