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 9.4-13.3; Al₂O₃ 2.0-2.6; B₂O₃ 40.0-45.0; ZnO 8.0-10.0; Ka₂O 2.0-3.0; K₂O 4.8-5.2; Li₂O 1.0-2.0; CaO 8.0-10.0; MgO 3.0-4.0; BaO 2.5-3.0; MnO₂ 3.0-3.2; CoO 1.0-1.4; Fe₂O₃ 6.0-6.6. The melting temperature is equal to 1300°C and burning temperature is equal to 850°C.

EFFECT: low melting temperature of the frit and burning temperature of the glase.

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