GLASS Russian patent published in 2007 - IPC C03C3/115 

FIELD: technology of silicates, glass industry.

SUBSTANCE: invention proposes glass comprises the following components, wt.-%: SiO₂, 48.0-53.0; CaO, 8.0-12.0; Na₂O, 1.0-2.0; P₂O₅, 4.0-6.0; MgO, 2.0-4.0; Fe₂O₃, 0.3-0.5; fluoride ions (F'), 0.5-0.7; B₂O₃, 24.0-28.0, and CuO, 2.0-4.0. Invention provides enhancing mechanical strength and decreasing coefficient of thermal expansion of glass. Proposed glass composition is used in manufacturing facing tiles.

EFFECT: improved and valuable properties of glass.

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