Abstract: A process for the manufacture of materials with a high chemical and mechanical resistance in which for each 100 parts by volume of vinylester resin treated with 0.85-1.47 parts by volume of an accelerant in the form of cobalt naphthenate, there are added at least in two batches 50-900 parts by volume of an inorganic filler constituting previously roasted at a temperature not lower than 470 K disintegrated to a particle size of at least 30 .mu.m phosphogypsum or a composition of phosphogypsum with glass-forming oxides or phosphogypsum with magnetite or phosphogypsum with microsphere, after which on continuous stirring there is added, if necessary, up to 60 parts by volume of styrene and/or up to 0.2 parts by volume of dimethylaniline, and then the whole is polymerized in the presence of know initiators such as organic peroxides. The materials with a high chemical and mechanical resistance constitute polymerized composition of synthetic resin and inorganic fillers, consisting of 7.5-88.

Abstract: This invention relates to a process for preparing ceramic-like materials with specific properties by binding an inorganic filler in the form of a dry composition with a grain size of up to 25 .mu.m containing in the volume ratio 1:0.-1.52 a waste phosphogypsum and magnetite or glass-forming oxides, with an unsaturated polyester resin in an amount of 46-220 volume parts per 100 volume parts of the filler. The use of magnetite makes it poisible to prepare materials with magnetic properties, while glass-foming oxides enable preparing materials effective to absorb an X-radiation of 45-55 keV and a hard radiation of 0.6-125 MeV. When an expanding agent is added to the raw composition according to this invention, an expanded material is obtained, having completely closed pores, particularly useful in the building industry.