Ultraviolet-absorbing glass article
The present invention relates to an ultraviolet-absorbing glass article containing, as represented by mass % based on oxides, as a glass matrix composition: 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%, FeO: 0.2 to 1.2%, total iron as represented by Fe 2 O 3 : 2.4 to 4%, and TiO 2 : more than 0% and 1% or less, containing from 50 to 400 mass ppm of CoO, containing from 0 to 70 mass ppm of Se, containing from 0 to 800 mass ppm of Cr 2 O 3 , having a total content of CoO, Se and Cr 2 O 3 of less than 0.1 mass %, and having an ultraviolet transmittance (TUV) (ISO9050:2003) of 2% or less at a thickness of 3.5 mm.
1. An ultraviolet-absorbing glass article comprising, as represented by mass% based on oxides, as a glass matrix composition:
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%,
FeO: 0.2 to 1.2%,
total iron as represented by Fe 2 O 3 : 2.4 to 4%, and
TiO 2 : more than 0% and 1% or less,
containing from 180 to 400 mass ppm of CoO,
containing from 0 to 70 mass ppm of Se,
containing from 0 to 800 mass ppm of Cr 2 O 3 ,
having a total content of CoO, Se and Cr 2 O 3 of less than 0.1 mass %,
having an ultraviolet transmittance (TUV) (ISO9050:2003) of 2% or less at a thickness of 3.5 mm, and
having a visible light transmittance (TVA) (JIS-R3106 (1998)) of 5% to 15% at a thickness of 3.5 mm as measured by using a standard illuminant A.
2. The ultraviolet-absorbing glass article according to claim 1 , further comprising from 0 to 1 mass % of NiO.
3. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 2.7 mass % or more.
4. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 3.0 mass % or less.
5. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 2.7 to 3.0 mass %.
6. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of FeO is 0.6 mass % or less.
7. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of Se is 3 mass ppm or more.
8. The ultraviolet-absorbing glass article according to claim 1 , comprises from 0 to 1 mass % of at least one selected from the group consisting of Sb, As, Cl, and F.
9. The ultraviolet-absorbing glass article according to claim 1 , having a dark gray color.
10. The ultraviolet-absorbing glass article according to claim 1 , having an ultraviolet transmittance (TUV) (ISO 9050:2003) of 2% or less at a thickness of 2.5 mm.
11. The ultraviolet-absorbing glass article according to claim 1 , having a visible light transmittance (TVA) (JIS-R3106 (1998)) of 12% or more and 26% or less at a thickness of 2.5 mm as measured by using a standard illuminant A.
12. The ultraviolet-absorbing glass article according to claim 1 , having a solar radiation transmittance (TE) (JIS-R3106 (1998)) of 35% or less at a thickness of 2.5 mm.
13. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of from 485 to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 35% or less as measured by using a standard illuminant C at a thickness of 2.5 mm.
14. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 5% or more and 15% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.
15. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 14.5% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.
16. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 13% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.
17. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 7% or more and 13% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.
18. The ultraviolet-absorbing glass article according to claim 1 , having a solar radiation transmittance (TE) (JIS-R3106 (1998)) of 20% or less at a thickness of 3.5 mm.
19. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of from 485 to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 45% or less as measured by using a standard illuminant C at a thickness of 3.5 mm.
20. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of 561.5 nm to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 45% or less as measured by using a standard illuminant C at a thickness of 3.5 mm.