Alkali free glass
AssigneeAsahi Glass Company, Limited
InventorsHideki Kushitani, Manabu Nishizawa, Yasumasa Nakao
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Abstract
An alkali free glass consisting essentially of from 50 to 60 wt % of SiO.sub.2, from 8 to 16 wt % of Al.sub.2 O.sub.3, from 4 to 10 wt % of B.sub.2 O.sub.3, from 1.5 to 5 wt % of MgO, from 0 to 7 wt % of CaO, from 0 to 10 wt % of SrO, from 10 to 20 wt % of BaO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides.
Claims4
An alkali free glass prepared by a float method consisting essentially of from 53 to 57 wt % of SiO.sub.2, from 10 to 14 wt % of Al.sub.2 O.sub.3, from 5.5 to 8.5 wt % of B.sub.2 O.sub.3, from 2 to 4.5 wt % of MgO, from 2 to 5 wt % of CaO, from 2 to 8 wt % of SrO, from 12 to 18 wt % of BaO and from 0 to 2 wt % of ZnO and essentially free from alkali metal oxides.
Dependencies are inferred from the claim text.