Such a brick is mainly used in the construction of interior partitions and other non -carrying structures. Since there are voids inside the brick, the material perfectly retains heat for quite a long time. In the manufacture of hollow bricks, various impurities are added to the main material, mainly sawdust, peat or coal. When firing, all impurities burn out, and emptiness forms. Since the material has a high degree of moisture absorption, and also loses its properties over time, it cannot be used to build basements or foundations.
