Boron-free universal glass
AssigneeSchott AG
InventorPeter BRIX
Life of this patent
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Abstract
Universal glasses are provided which have the composition, in percent by weight on an oxide basis, 65-75 of SiO2, 11-18 of Al2O3, 5-10 of MgO, 5-10 of CaO, which are free of B2O3, SrO, BaO, CeO2 and PbO and have a hydrolytic resistance in the first class in accordance with DIN ISO 719, an acid resistance at least in the second class in accordance with DIN 12116 and an alkali resistance at least in the second class in accordance with DIN ISO 695.
Claims19
A universal glass comprising, in percent by weight on an oxide basis:
- SiO2
- 68-71
- Al2O3
- 12.5-14
- MgO
- 5-10
- CaO
- 5-10;
- wherein the total content of MgO and CaO is 14-18% by weight;
- wherein, except for unavoidable impurities, no B2O3, SrO, BaO, CeO2, ZnO, TiO2, Fe2O3, ZrO2, alkali metal oxides and PbO are present;
- and
- wherein the hydrolytic resistance in accordance with DIN ISO 719 is in the 1st hydrolytic class, the acid resistance in accordance with DIN 12116 is at least in the 2nd acid class and the alkali resistance in accordance with DIN ISO 695 is in at least the 2nd alkali class.
A universal glass comprising, in percent by weight on an oxide basis:
- SiO2
- 65-75,
- Al2O3
- 11-18,
- MgO
- 5-10,
- CaO
- 5-10,
- wherein, except for unavoidable impurities, no B2O3, SrO, BaO, CeO2 and PbO are present and the hydrolytic resistance in accordance with DIN ISO 719 is in the 1st hydrolytic class, the acid resistance in accordance with DIN 12116 is at least in the 2nd acid class and the alkali resistance in accordance with DIN ISO 695 is in at least the 2nd alkali class.
A universal glass comprising the following constituents, in percent by weight on an oxide basis:
- SiO2
- 68-71,
- Al2O3
- 12.5-14,
- MgO
- 5-10,
- CaO
- 5-10,
- wherein, except for unavoidable impurities, no B2O3, SrO, BaO, CeO2, ZnO, TiO2, Fe2O3, alkali metal oxides and PbO are present and the hydrolytic resistance in accordance with DIN ISO 719 is in the 1st hydrolytic class, the acid resistance in accordance with DIN 12116 is at least in the 2nd acid class and the alkali resistance in accordance with DIN ISO 695 is in at least the 2nd alkali class.
Dependencies are inferred from the claim text.