GLAZE Russian patent published in 2008 - IPC C03C8/00 C04B41/86 

FIELD: chemistry.

SUBSTANCE: invention pertains to compounds for un-fritted lead glazes, which can be used for coating faced tiles, moulded decorations for buildings and other architectural structures. The glaze consists of SiO₂, PbO, Al₂O₃, CaO, MgO, Fe₂O₃, Na₂O, Sb₂O₃, B₂O₃, ZnO and extra TiO₂, with the following percentage mass ratios: SiO₂ - 30.0-35.0, PbO - 37.0-43.0, Al₂O₃ - 2.0-4.0, CaO -0.5-1.5, MgO - 4.0-6.0, Fe₂O₃ - 0.3-0.5, Na₂O - 1.5-2.5, Sb₂O₃.0.7-1.5, B₂O₃ - 9.0-12.0, ZnO - 2.0-4.0, TiO₂ - 1.0-2.0.

EFFECT: increased frost resistance of the glaze.

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