A white glass includes, in terms of mole percentage on the basis of oxides, from 50% to 74% of SiO 2 , from 0 to 8% of B 2 O 3 , from 1% to 8% of Al 2 O 3 , from 0 to 18% of MgO, from 0 to 7% of CaO, from 0 to 10% of SrO, from 0 to 12% of BaO, from 0 to 5% of ZrO 2 , from 5% to 15% of Na 2 O and from 2% to 10% of P 2 O 5 . In the white glass, a total content of CaO, SrO and BaO is from 1% to 22%, a total content RO of MgO, CaO, SrO and BaO is from 5% to 25% and a ratio CaO/RO of a content of CaO to the RO is 0.7 or less.
1. A white glass comprising: in terms of mole percentage on the basis of oxides, from 50% to 65% of SiO 2 ; from 0 to 8% of B 2 O 3 ; from 4.0% to 8% of Al 2 O 3 ; from 6.0 to 18% of MgO; from 0 to 5% of CaO; from 0 to 10% of SrO; from 0 to 12% of BaO; from 0 to 5% of ZrO 2 ; from 5% to 15% of Na 2 O; and from 2% to 10% of P 2 O 5 , wherein a total content of CaO, SrO and BaO is from 1% to 22%, a total content RO, which is a total content of MgO, CaO, SrO and BaO, is from 7% to 25%, a ratio CaO/RO, which is a ratio of a content of CaO to the total content RO, is 0.7 or less, and a ratio CaO/P 2 O 5 , which is a ratio of the content of CaO to a content of P 2 O 5 , is 0.59 or less.
2. The white glass according to claim 1 , wherein the white glass comprises: in terms of mole percentage on the basis of oxides, from 50% to 65% of SiO 2 ; from 0 to 8% of B 2 O 3 ; from 4.0% to 8% of Al 2 O 3 ; from 6.0 to 18% of MgO; from 0 to 5% of CaO; from 0 to 10% of SrO; from 0 to 12% of BaO; from 0 to 5% of ZrO 2 ; from 5% to 15% of Na 2 O; and from 2% to 10% of P 2 O 5 , wherein the total content of CaO, SrO and BaO is from 1% to 15%, the total content RO is from 10% to 25%, the ratio CaO/RO is 0.7 or less, and the ratio CaO/P 2 O 5 is 0.59 or less.
3. The white glass according to claim 1 , wherein the white glass comprises 6.0% less than 11% of MgO.
4. The white glass according to claim 1 , wherein the white glass comprises: from 55% to 62% of SiO 2 ; from 4.0% to 7% of Al 2 O 3 ; from 6.0% to 10% of MgO; from 8% to 12% of Na 2 O; and from 3% to 7% P 2 O 5 .
5. The white glass according to claim 1 , wherein the white glass comprises 9% or more of Na 2 O.
6. The white glass according to claim 1 , wherein the white glass comprises 0.5% or more of ZrO 2 .
7. The white glass according to claim 1 , wherein the white glass comprises 1% or more of BaO.
8. The white glass according to claim 1 , wherein the white glass comprises from 50% to 62.3% of SiO 2 .
9. The white glass according to claim 1 , wherein a crystal is not precipitated in the white glass.
10. The white glass according to claim 1 , wherein a linear transmittance of light having a wavelength of 600 nm of the white glass at a thickness of 1 mm is 2% or less.
11. The white glass according to claim 1 , wherein the white glass is for use in a building material.
12. The white glass according to claim 11 , wherein the white glass which is for an interior use of a gallery or tunnel.
13. A housing comprising the white glass according to claim 1 .
14. An electronic device, comprising the housing according to claim 13 .
15. The electronic device according to claim 14 , wherein the electronic device is a portable communication device or portable information device.
16. A white glass comprising: in terms of mole percentage on the basis of oxides, from 50% to 65% of SiO 2 ; from 0 to 8% of B 2 O 3 ; from 4.0% to 8% of Al 2 O 3 ; from 6.0 to 18% of MgO; from 0 to 5% of CaO; from 0 to 10% of SrO; from 0 to 12% of BaO; from 0 to 5% of ZrO 2 ; from 5% to 15% of Na 2 O; and from 2% to 10% of P 2 O 5 , wherein a total content of CaO, SrO and BaO is from 1% to 22%, a total content RO, which is a total content of MgO, CaO, SrO and BaO, is from 7% to 25%, a ratio CaO/RO, which is a ratio of a content of CaO to the total content RO, is 0.7 or less, a ratio CaO/P 2 O 5 , which is a ratio of the content of CaO to a content of P 2 O 5 , is 0.59 or less, and the white glass has a compressive stress layer in a surface thereof.
17. The white glass according to claim 16 , wherein the white glass comprises: in terms of mole percentage on the basis of oxides, from 50% to 65% of SiO 2 ; from 0 to 8% of B 2 O 3 ; from 4.0% to 8% of Al 2 O 3 ; from 6.0 to 18% of MgO; from 0 to 5% of CaO; from 0 to 10% of SrO; from 0 to 12% of BaO; from 0 to 5% of ZrO 2 ; from 5% to 15% of Na 2 O; and from 2% to 10% of P 2 O 5 , wherein the total content of CaO, SrO and BaO is from 1% to 20%, the total content RO is from 6% to 25%, the ratio CaO/RO is 0.7 or less, the ratio CaO/P 2 O 5 is 0.59 or less, and the white glass has the compressive stress layer in the surface thereof.
18. The white glass according to claim 16 , wherein the white glass comprises: in terms of mole percentage on the basis of oxides, from 50% to 65% of SiO 2 ; from 0 to 8% of B 2 O 3 ; from 4.0% to 8% of Al 2 O 3 ; from 6.0 to 18% of MgO; from 0 to 5% of CaO; from 0 to 10% of SrO; from 0 to 12% of BaO; from 0 to 5% of ZrO 2 ; from 5% to 15% of Na 2 O; and from 2% to 10% of P 2 O 5 , wherein the total content of CaO, SrO and BaO is from 1% to 15%, and the total content RO is from 10% to 25%.
19. The white glass according to claim 16 , wherein the white glass comprises from 50% to 62.3% of SiO 2 .
20. The white glass according to claim 16 , wherein the compressive stress layer has a thickness of 10 μm or more and a surface compressive stress of the compressive stress layer is 300 MPa or more.
21. The white glass according to claim 16 , wherein a total light reflectance of light having a wavelength of 600 nm of the white glass is 45% or more.
22. The white glass according to claim 16 , wherein the white glass is for use in a building material.
23. The white glass according to claim 22 , wherein the white glass is for an interior use of a gallery or tunnel.
24. A housing comprising the white glass according to claim 16 .
25. An electronic device, comprising the housing according to claim 24 .
26. The electronic device according to claim 25 , wherein the electronic device is a portable communication device or portable information device.