BLACK GLASE Russian patent published in 2011 - IPC C03C8/04 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of silicates and glase compositions for depositing on facing tiles and decorative and art articles. The black glase contains the following in wt %: SiO₂ 30.5-36.4; Al₂O₃ 6.0-8.0; B₂O₃ 10.0-14.0; ZnO 5.2-5.4; Na₂O 2.0-3.0; K₂O 4.8-5.2; Li₂O 1.0-2.0; CaO 4.0-6.0; MgO 4.0-6.0; BaO 2.0-2.4; MnO₂ 3.0-3.2; CoO 4.0-5.0; Fe₂O₃ 4.2-5.0; PbO 8.0-10.0. Frit melting point - 1300°C, burning temperature - 950°C.

EFFECT: low melting point and burning temperature of glase.

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