COLOURED GLAZE Russian patent published in 2009 - IPC C03C8/04 C03C8/12 

FIELD: chemistry; construction.

SUBSTANCE: present invention relates to the technology of silicates and glaze compositions for depositing on finish tiles and household ceramic objects. The glaze has the following components, in wt %: SiO₂ 56.0-62.0; Al₂O₃ 22.0-24.0; TiO₂, 1.0-2.0; CaO 1.0-2.0; Na₂O 1.0-2.0; K₂O 1.0-2.0; ZrO₂ 6.2-7.0; ZnO 1.0-2.0; B₂O₃, 3.0-4.0; CuO 0.2-0.3; PbO 0.2-0.3; BaO 0.2-0.3; CoO 0.2-0.3. The glaze has heat resistance of 320-330°C. The glaze forms a smooth, even cyan-blue coating.

EFFECT: increased heat resistance of the glaze.

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