ALKALI-RESISTANT HIGH-STRENGTH ALUMOSILICATE GLASS Russian patent published in 2008 - IPC C03C3/78 

FIELD: manufacture of alumosilicate glass.

SUBSTANCE: proposed glass contains the following components, mass-%: SiO₂, Al₂O₃, ZrO₂, Na₂O, MgO, ZnO and L₂O at the following ratio of components, mass-%: SiO₂, 54.5-56.5; Al₂O₃, 19-21.0; ZrO₂,, 1.0-2.0; Na₂O, 5.0-6.7; MgO, 5.5-6.5; ZnO, 7.5-8.8; Li₂O, 2.5-3.0. Alkali resistance of glass is corresponds to class 1, GOST 10134.3-82; strength at lateral bending, 240-274 Mpa; heat resistance is 440-540K. Alkali-resistant high-strength alumosilicate glass is used for manufacture of inspection windows in industrial plants working under conditions of high pressure, high temperatures in handling alkali or hydrocarbon media.

EFFECT: enhanced strength and heat resistance of glass at retained high alkali resistance.

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