Abstract Cordierite electric ceramics have an important role in modern technology. So far, this material has been used in electrothermics for the production of electric heater supports. However, nowadays, due to its electrical, electromechanical, and especially thermal properties, this ceramic finds its application in electronics for the production of microelectronic components or in the machine-building industry for manufacture of internal combustion components. In this paper, the results of the production of the cordierite ceramics based on sepiolite, as a magnesium silicate component, are presented. For a realistic evaluation of the cordierite quality, which is obtained from nonstandard raw materials, parallel investigations were made with one commercial cordierite mass, which contains talc. The end goal of these investigations is to examine a possibility of application of cordierite ceramics in foundry and defining the technological parameters of production of refractory coatings for sand moulds and cores, as well as of production of refractory linings for application in Lost Foam process. It should be emphasized that cordierite ceramics so far has not been applied in foundry.