What raw materials are the most suitable?
Any kind of above mentioned raw materials are suitable with some preferences. Dolomite or agrillaceous (marl) lime-stone of soft type (coquina) is used at brick fabrication. It allows to gain high physical and mechanical properties of brick (240-250 kg/cm2, 150 frost resistance cycles), reliable repeatability of result and less depreciation of mould. Either hard lime-stone of soft granite (200-300 kg/cm2) are used in production of sidewalk tile. These materials allow to gain high physical amd mechanical properties of tile (600-750 kg/cm2, 500 frost resistance cycles), reliable repeatability of results and normal depreciation of mould.
