Claims
- 1. Low transmittance glass composed of soda-lime-silica glass,
wherein said soda-lime-silica glass includes 0.001 to 2 wt. % Li2O and, as colorant, 0.7 to 2.2 wt. % total iron oxide expressed as Fe2O3 (T-Fe2O3); and wherein said glass has visible light transmittance (YA) of not greater than 65%, measured by using the CIE illuminant A, total solar radiation transmittance (TG) of not greater than 60%, and ultraviolet transmittance (Tuv) defined by ISO 9050 of not greater than 25%, when said glass has a thickness between 2.1 mm and 6 mm.
- 2. Low transmittance glass as claimed in claim 1, wherein Li2O is contained in an amount of less than 2 wt. %.
- 3. Low transmittance glass as claimed in claim 1, wherein Li2O is contained in an amount of 0.05 to 0.5 wt. %.
- 4. Low transmittance glass as claimed in claim 1, wherein said low transmittance glass includes FeO expressed as Fe2O3 in an amount of 20 to 50% of T-Fe2O3.
- 5. Low transmittance glass as claimed in claim 1, wherein said low transmittance glass has base glass composition consisting essentially of:
65 to 80 wt. % SiO2; 0 to 5 wt. % Al2O3; 0 to 10 wt. % MgO; 5 to 15 wt. % CaO wherein a total amount of MgO and CaO is 5 to 15 wt. %; 10 to 20 wt. % Na2O; 0 to 5 wt. % K2O wherein a total amount of Na2O and K2O is 10 to 20 wt. %; and 0 to 5 wt. % B2O3.
- 6. Low transmittance glass as claimed in claim 1, wherein said low transmittance glass includes at least one selected from the group consisting of Se, CoO, Cr2O3 and NiO as colorant.
- 7. Low transmittance glass as claimed in claim 6, wherein said low transmittance glass includes 0.0001 to 0.1 wt. % Se.
- 8. Low transmittance glass as claimed in claim 6, wherein said low transmittance glass includes 0.0001 to 0.1 wt. % CoO.
- 9. Low transmittance glass as claimed in claim 6, wherein said low transmittance glass includes 0.001 to 2 wt. % Cr2O3.
- 10. Low transmittance glass as claimed in claim 6, wherein said low transmittance glass includes 0.001 to 2 wt. % NiO.
- 11. Low transmittance glass as claimed in claim 1, wherein said low transmittance glass includes at least one selected from the group consisting of TiO2, CeO2, MoO3, V2O5 and La2O3 as colorant in an amount of 0.0001 to 1 wt. %.
- 12. Low transmittance glass as claimed in claim 1, wherein said low transmittance glass has visible light transmittance (YA) of 5 to 65%, measured by using the CIE illuminant A, total solar radiation transmittance (TG) of not greater than 50%, and ultraviolet transmittance (Tuv) defined by ISO 9050 not greater than 20%, when said glass has a thickness between 2.1 mm and 6 mm.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2001-188260 |
Jun 2001 |
JP |
|
2001-197642 |
Jun 2001 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATION
[0001] This is a divisional application of a patent application Ser. No. 10/166,064 filed on Jun. 11, 2002.
Divisions (1)
|
Number |
Date |
Country |
Parent |
10166064 |
Jun 2002 |
US |
Child |
10815921 |
Apr 2004 |
US |