The article presents the results of research on the development of optimal chemical, charge and fractional compositions of dinas ramming masses for lining of thermal units. It has been established that the best results, in terms of material composition and thermo mechanical properties, are dominated by prototypes based on quartzite, with a content of quartz sand and kaolin not higher than 20 wt. %. The possibilities of partial replacement of quartzite with quartz sand in the development of new compositions of dinas ramming masses are shown. Ill. 1. Ref. 15. Tab. 5.