The invention presents the results of studies of the properties of pressed gypsum composites obtained on the basis of gypsum dihydrate. Modification improves the performance and processing properties of the resulting composites. High physical (for example ??0= 1800-2100 kg/m3) and mechanical properties of the composite (Rcompression=76 MPa) makes it an indispensable application in the manufacture of building products for industrial and residential construction. Especially for objects where necessary to ensure increased requirements for fire and environmental safety.