GLAZE FRIT Russian patent published in 1994 - IPC

FIELD: manufacture of facing and ornamental ceramics. SUBSTANCE: frit mixture contains the following components, % by weight: aluminum oxide Al₂O₃; 4.5-6.5; boron oxide B₂O₃; 21-22; potassium oxide K₂O ; 0.1-0.2; sodium oxide Na₂O ; 6.0-8.0; calcium oxide CaO 4.0-6.0; magnesium oxide MgO 0.6-0.8; phosphorous oxide P₂O₅; 3-4; iron oxide Fe₂O₃; 8-10; barium oxide BaO 4-5; silicon SiO₂ for the balance. EFFECT: improved quality of ceramics. 1 tbl