DECORATIVE COMPLEX CAST Russian patent published in 1994 - IPC

FIELD: decorative and facing materials. SUBSTANCE: decorative complex cast has, wt.-%: silicon oxide (SiO₂) 25-35; sodium oxide (Na₂O) 3-10; potassium oxide (K₂O) 0.1-5; calcium oxide (CaO) 8-15; aluminium oxide (Al₂O₃) 5-22; ferrous oxide (FeO) 0.1-0.4; ferric oxide (Fe₂O₃) 1-15; titanium oxide (TiO₂) 10-25; magnesium oxide (MgO) 0.5-1.0; boron oxide (B₂O₃) 2-6, and copper oxide (CuO) 0.1-1.0. Properties: compression strength is 720-900 MPa, bending strength is 175-225 MPa, hardness is 740-950 kg/mm². Material is used for making of decorative and facing materials. EFFECT: enhanced quality of material. 1 tbl