“…According to the planning matrix, an experiment was conducted, the adequacy of the obtained regression equations was checked, and nomograms were constructed Analysis of nomograms to determine the optimal pressing pressure (Fig. 1) after separate grinding showed that it was possible to obtain the ceramic brick brands from M120 to M225 with satisfying physical and mechanical properties, where the average density is in the range from 1,6 to 1,98 g / cm 3 and with water absorption 12-14 %. The selected areas determine the optimal pressure in the range from 19,5 to 20,5 MPa, which is confirmed by the previous studies [6].…”