Glass composition which is resistant to alkali
AssigneeAsahi Glass Company, Limited
InventorsYoshiro Suzuki, Hironori Ohta, Masuo Shirasaka
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Abstract
A glass composition which possesses a chemical resistance. The glass composition consists essentially of SiO.sub.2 : 45 - 65 wt.% ZrO.sub.2 : 10 - 20 wt.% Cr.sub.2 O.sub.3 : 0 - 5 wt.% SnO.sub.2 : 0 - 5 wt.% Ro: 0 - 18 wt.% R'.sub.2 o: 0 - 18 wt.% So.sub.3 : 0.05 - 1 wt.% Wherein the sum of contents of Cr.sub.2 O.sub.3 + SnO.sub.2 is 0.5 - 10 wt.%; the sum of contents of ZrO.sub.2 + SnO.sub.2 + Cr.sub.2 O.sub.3 is 12 - 25 wt.%; RO is selected from the group consisting of CaO, MgO, ZnO, BaO, and SrO; and R'.sub.2 O is selected from the group consisting of K.sub.2 O of 0 - 5 wt.%, Na.sub.2 O of 0 - 18 wt.% and Li.sub.2 O of 0 - 5 wt.%.
Claims6
A glass composition consisting of
- SiO.sub.2 :45-65 wt.%
- ZrO.sub.2 :10-20 wt.%
- Cr.sub.2 O.sub.3 :0-5 wt.%
- SnO.sub.2 :0-5 wt.%
- Ro:0-18 wt.%
- R'.sub.2 o:0-18 wt.%
- So.sub.3 :0.05-1 wt.%
- and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of Cr.sub.2 O.sub.3 + SnO.sub.2 is 0.5-10 wt.% and the sum of contents of ZrO.sub.2 + SnO.sub.2 + Cr.sub.2 O.sub.3 is 12-25 wt.% and RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO;
- and R'.sub.2 O is selected from the group consisting of K.sub.2 O of 0-5 wt.%, Na.sub.2 O of 0-18 wt.% and Li.sub.2 O of 0-5 wt.%.
A glass composition consisting
- SiO.sub.2 :45-65 wt.%
- ZrO.sub.2 :10-20 wt.%
- Cr.sub.2 O.sub.3 :0-5 wt.%
- SnO.sub.2 :0.5-5 wt.%
- Ro:0-15 wt.%
- R'.sub.2 o:5-18 wt.%
- So.sub.3 :0.05-1 wt.%
- and less than 3 wt.% of a refining agent or impurities, wherein the sum of contents of ZrO.sub.2 + SnO.sub.2 + Cr.sub.2 O.sub.3 is 12-25 wt.%;
- RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R'.sub.2 O is selected from the group consisting of K.sub.2 O of 0-5 wt.%, Na.sub.2 O of 5-18 wt.% and Li.sub.2 O of 0-5 wt.%.
A glass composition consisting of
- SiO.sub.2 :45-65 wt.%
- ZrO.sub.2 :10-20 wt.%
- Cr.sub.2 O.sub.3 :0.5-5 wt.%
- SnO.sub.2 :0.5-5 wt.%
- Ro:5-15 wt.%
- R'.sub.2 o:5 - 15 wt.%
- So.sub.3 :0.05 - 1 wt.%
- and less than 3 wt.% of a refining agent or impurities,
- wherein the sum of contents of ZrO.sub.2 + SnO.sub.2 + Cr.sub.2 O.sub.3 is 12 - 25 wt.%, RO is selected from the group consisting of CaO, MgO, ZnO, BaO and SrO and R'.sub.2 O is selected from the group consisting of K.sub.2 O of 0-3 wt.%, Na.sub.2 O of 5-15 wt.% and Li.sub.2 O of 0 - 3 wt.%.
Dependencies are inferred from the claim text.