Ultraviolet-radiation absorbing glass product
Provided is an ultraviolet-radiation absorbing glass product, characterized by: having a transmittance of ultraviolet radiation (TUV), as specified by ISO 9050: 2003, of 2% or less at a plate thickness of 3.5 mm, and transmittance of visible light (TVA) of 8 to 28% inclusive, based on the Standard Illuminant A at a plate thickness of 3.5 mm; and the color of the glass, as denoted by the chromaticity coordinates x, y in the XYZ color coordinate system based on a 2-degree visual field of the Standard Illuminant C as specified by JIS Z8701: 1999, satisfying the following expressions (1) and (2). (1) y≥−0.735×x+0.544 (2) y≥1.389×x−0.089
1. An ultraviolet absorbing glass article comprising, in mass % based on oxides:
SiO 2
66 to 75%,
Na 2 O
10 to 20%,
CaO
5 to 15%,
MgO
0 to 6%,
Al 2 O 3
0 to 5%,
K 2 O
0 to 5%,
Fe 2 O 3
0.5 to 3%,
FeO
0.2 to 0.5%,
TiO 2
0.1 to 3%,
CoO
0.014 to 0.04%,
Se
0.0001 to 0.004%,
Cr 2 O 3
0.06% or less, and
NiO
0.1% or less,
as a glass matrix composition,
a Redox, which is (a content of divalent iron (Fe 2+ ) in terms of Fe 2 O 3 )/(a total content of divalent iron (Fe 2+ ) in terms of Fe 2 O 3 and trivalent iron (Fe 3+ ) in terms of Fe 2 O 3 ), being 15 to 35%,
a content of Fe 2 O 3 +TiO 2 being 1.2% or more,
the content of CoO being 0.014% or more and 0.032% or less in the case where a content of NiO is 0%,
the content of CoO being more than 0.032% and 0.04% or less in the case where the content of NiO is more than 0.06% and 0.1% or less, and
the content of CoO being 0.014 to 0.04% in the case where the content of NiO is more than 0% and 0.06% or less,
the contents of Fe 2 O 3 , FeO, TiO 2 , CoO, Se, Cr 2 O 3 and NiO satisfying formula (a),
the ultraviolet absorbing glass article having:
an ultraviolet transmittance (TUV) specified by ISO 9050:2003 at a sheet thickness of 3.5 mm being 2% or less,
a visible light transmittance (TVA) based on a Standard Illuminant A at a sheet thickness of 3.5 mm being 10% or more and 16.7% or less, and
a color of the glass represented by chromaticity coordinates x and y in a XYZ color coordinate system based on a two-degree visual field of a Standard Illuminant C specified by JIS Z8701:1999 satisfying formulae (1) and (2):
−0.0398−0.002×(Fe 2 O 3 )+0.097×(FeO)+0.0019×(TiO 2 )+0.95×(CoO)−21.16×(Se)+0.66×(Cr 2 O 3 )−0.030×(NiO)≥0 (a)
y ≥−0.735× x+ 0.544 (1)
y≥ 1.389× x− 0.089 (2).
2. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Cr 2 O 3 is 0.04% or less.
3. The ultraviolet absorbing glass article according to claim 1 , wherein the content of CoO is 0.0170% or more.
4. The ultraviolet absorbing glass article according to claim 1 , wherein the content of NiO is 0.07% or less.
5. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Fe 2 O 3 is 0.5 to 1.85%.
6. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Fe 2 O 3 is 1 to 1.85%.
7. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Fe 2 O 3 is 0.5 to 1.6%.
8. The ultraviolet absorbing glass article according to claim 1 , wherein the content of FeO is 0.30 to 0.5%.
9. The ultraviolet absorbing glass article according to claim 1 , wherein the content of FeO is 0.2 to 0.39%.
10. The ultraviolet absorbing glass article according to claim 1 , wherein the content of TiO 2 is 0.4 to 3%.
11. The ultraviolet absorbing glass article according to claim 1 , wherein the content of Fe 2 O 3 +TiO 2 is 1.5% or more.
12. The ultraviolet absorbing glass article according to claim 1 , wherein the content of CoO is 0.014 to 0.022% in the case where the content of NiO is more than 0% and 0.06% or less.
13. The ultraviolet absorbing glass article according to claim 1 , wherein the content of CoO is 0.0170% to 0.04% in the case where the content of NiO is more than 0% and 0.06% or less.
14. The ultraviolet absorbing glass article according to claim 1 , wherein the content of CoO is 0.020% or more and 0.032% or less in the case where the content of NiO is 0%.
15. The ultraviolet absorbing glass article according to claim 1 , wherein the content of CoO is 0.014% or more and 0.0285% or less in the case where the content of NiO is 0%.
16. The ultraviolet absorbing glass article according to claim 1 , having an energy transmittance (TE) specified by JIS-R3106:1998 at a sheet thickness of 3.5 mm being 22% or less.
17. The ultraviolet absorbing glass article according to claim 1 , having the ultraviolet transmittance (TUV) specified by ISO 9050:2003 at a sheet thickness of 3.5 mm being 1% or less.
18. The ultraviolet absorbing glass article according to claim 1 , having an ultraviolet transmittance (TUV400) specified by ISO 13837:2008 convention A at a sheet thickness of 3.5 mm being 5% or less.