UNFRITTED GLAZE FOR CERAMIC FACING PLATES Russian patent published in 1998 - IPC

FIELD: glazing of facing plates intended for sanitary and technical purposes. SUBSTANCE: unfritted glaze comprises, mas.%: silicium oxide having common formula SiO₂, 25.02-32.55; potassium oxide having common formula K₂O, 0.98-1.46; aluminium oxide having common formula Al₂O₃, 5.06-7.61; ferrum oxide having common formula Fe₂O₃, 0.13-0.19; titanium oxide having common formula TiO₂, 0.02-0.04; zinc oxide having common formula ZnO, 2.81-4.20; calcium oxide having common formula CaO, 24.15-30.26; zirconium oxide having common formula ZrO₂, 3.95-5.94; magnesium oxide having common formula MgO, 0.23-0.36; boron oxide having common formula B₂O₃, 21.26-31.87; sodium oxide having common formula Na₂O, 0.74-1.13; manganese oxide having common formula MnO, 0.01-0.02. Roasting temperature of glaze is 920-950 C, its microhardness is 50-70 MPa, its whiteness is 50-70 %. EFFECT: improved quality of desired product. 2 tbl