Abstract
The definition of tThe definition of the concept of stability and the list of instability indicators are provided for different metallurgical materials of CRMs. The methods and the results of studying the stability of dispersed materials of CRMs of the iron ore, ferroalloys, slags, and fluxes are presented. A few examples of unstable metallurgical materials of CRM are given. The study and monitoring of the stability of dispersed materials provides reasonable determination of the expiration date of the CRM instance. The chemical composition of chips and powders of steels, cast irons and alloys remained the same for 30 years. Monolithic CRMs of steels, alloys and cast irons for physical methods of analysis do not change their metrological characteristics for more than 50 years and do not require any control of stability during indicated period of time.
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