Expanded clay has the form of oval or round granules. This material is obtained by firing in furnaces with constant rotation of clay rocks, which tend to swell with a sharp increase in temperature to 1300 ° C. Expanded clay grain looks like a vitreous porous mass, coated. Depending on the clay processing mode, expanded clay of various bulk density and sizes can be obtained, which determines the quality of expanded clay. JSC "Expanded clay gravel plant Novolukoml" produces expanded clay in three sizes (fractions): 0/4 mm, 4/10 mm and 10/16 mm. Expanded clay gravel is characterized by properties such as fire resistance, frost resistance, water resistance and the absence of impurities that are harmful to humans and the environment.