Alkali-free glass
AssigneeNippon Electric Glass Co., Ltd.
InventorsMasataka Kawaguchi, Masataka Takagi
Life of this patent
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Abstract
A subject for the invention is to provide an alkali-free glass which is capable of reducing or totally eliminating As2O3 and which has fewer bubble inclusion than that in the prior technology. The invention relates to an alkali-free glass which comprises SiO2 in an amount of from 40 to 70% by weight; Al2O3 in an amount of from 6 to 25% by weight; B2O3 in an amount of from 5 to 20% by weight; MgO in an amount of from 0 to 10% by weight; CaO in an amount of from 0 to 15% by weight; BaO in an amount of from 0 to 30% by weight; SrO in an amount of from 0 to 10% by weight; ZnO in an amount of from 0 to 10% by weight, each based on the total amount of said glass, and helium and/or neon in an amount of from 0.0001 to 2 μl/g (0° C., 1 atm.).
Claims8
An alkali-free glass which comprises:
- SiO2 in an amount of from 40 to 70% by weight;
- Al2O3 in an amount of from 6 to 25% by weight;
- B2O3 in an amount of from 5 to 20% by weight;
- MgO in an amount of from 0 to 10% by weight;
- CaO in an amount of from 0 to 15% by weight;
- BaO in an amount of from 0 to 30% by weight;
- SrO in an amount of from 0 to 10% by weight;
- ZnO in an amount of from 0 to 10% by weight,
- each based on the total amount of said glass, and
- helium and/or neon in an amount of from 0.0001 to 2 μl/g (0° C., 1 atm.).
Dependencies are inferred from the claim text.