Glass sheet capable of having controlled warping through chemical strengthening
AssigneeAgc Glass Europe
InventorsThomas Lambricht, Audrey Dogimont, Aline Degand, Florence Scheyvaerts
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Abstract
A float glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass: 65≤SiO2≤78% 5≤Na2O≤20% 1≤K2O<8% 1≤Al2O3<6% 2≤CaO<10% 0≤MgO≤8%; K2O/(K2O+Na2O) ratio which is from 0.1 to 0.7; wherein the glass sheet has: 0.01 < ( Na 2 O ) air ( Na 2 O ) tin - 1.03 ≤ 3. The glass sheet may be a chemically-temperable soda-silica type glass composition suitable for mass production that shows reduced or controlled increased warping effect.
Claims19
A float glass sheet comprising the following in weight percentage, expressed with respect to the total weight of glass:
- 65≤SiO2≤78%;
- 5≤Na2O≤20%;
- 1≤K2O<8%;
- 1≤Al2O3<6%;
- 2≤CaO<10%;
- 0≤MgO≤8%;
- and
- K2O/(K2O+Na2O) ratio of from 0.1 to 0.7,
- wherein the glass sheet has:
- 0.01
- <
-
- (
- Na
- 2
-
- O
- )
- air
- (
- Na
- 2
-
- O
- )
- tin
- -
- 1.03
-
- ≤
- 3
- ,
- and
- wherein the glass sheet is boron- and lithium-free.
A float glass sheet comprising the following in weight percentage, expressed with respect to the total weight of glass:
- 65≤SiO2≤78%;
- 5≤Na2O≤20%;
- 1≤K2O<8%;
- 3≤Al2O3<6%;
- 2≤CaO<10%;
- 0≤MgO≤8%;
- and
- K2O/(K2O+Na2O) ratio of from 0.1 to 0.7,
- wherein the glass sheet has:
- 0.02
- <
-
- (
- Na
- 2
-
- O
- )
- air
- (
- Na
- 2
-
- O
- )
- tin
- -
- 1.03
-
- ≤
- 3
- ,
- and
- wherein the glass sheet is boron- and lithium-free.
Dependencies are inferred from the claim text.