Ultraviolet ray transmitting glass composition and glass article making use of the same
An ultraviolet ray transmitting glass composition including the following components, in terms of mass % or mass ppm: 60 to 79% SiO 2 ; 0 to 1% B 2 O 3 ; exceeded 0% but not more than 20% Al 2 O 3 ; 0 to 10% Li 2 O; 5 to 20% Na 2 O; 0 to 15% K 2 O; 0 to 10% MgO; 0 to 10% CaO; 0 to 15% SrO; 0 to 2% refining agent; 2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by converting all of iron compounds into Fe 2 O 3 ); and 0 to 200 ppm TiO 2 . The ultraviolet ray transmitting glass composition is suitable for a glass article, such as a bioanalytical device that is used for analysis using ultraviolet rays.
1. An ultraviolet ray transmitting glass composition consisting essentially of following components, in terms of mass % or mass ppm:
60 to 79% SiO 2 ;
0 to 1% B 2 O 3 ;
exceeded 0% but not more than 20% Al 2 O 3 ;
0 to 10% Li 2 O;
5 to 20% Na 2 O;
0 to 15% K 2 O;
0 to 10% MgO;
0 to 10% CaO;
0 to 15% SrO;
0 to 2% refining agent;
2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by reducing all of iron compounds to Fe 2 O 3 ); and
0 to 200 ppm TiO 2 ,
wherein the ultraviolet ray transmitting glass composition has an ultraviolet ray transmittance of at least 50% relative to a wavelength of 260 nm when formed into a glass sheet having a thickness of 1 mm.
2. The ultraviolet ray transmitting glass composition according to claim 1 , consisting essentially of the following components, in terms of mass % or mass ppm:
60 to 79% SiO 2 ;
0 to 1% B 2 O 3 ;
1 to 20% Al 2 O 3 ;
0 to 10% Li 2 O;
5 to 20% Na 2 O;
0 to 15% K 2 O;
0 to 10% MgO;
0 to 10% CaO;
0 to 15% SrO;
0 to 2% refining agent;
2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by reducing all of iron compounds to Fe 2 O 3 ); and
0 to 200 ppm TiO 2 .
3. The ultraviolet ray transmitting glass composition according to claim 1 , consisting essentially of the following components, in terms of mass % or mass ppm:
60 to 79% SiO 2 ;
0 to 1% B 2 O 3 ;
1 to 20% Al 2 O 3 ;
0 to 10% Li 2 O;
5 to 16% Na 2 O;
0 to 15% K 2 O;
0 to 10% MgO;
0 to 10% CaO;
0 to 15% SrO;
0 to 2% refining agent;
2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by converting all of iron compounds into Fe 2 O 3 ); and
0 to 200 ppm TiO 2 .
4. The ultraviolet ray transmitting glass composition according to claim 1 , consisting essentially of the following components, in terms of mass % or mass ppm:
65 to 75% SiO 2 ;
0 to 1% B 2 O 3 ;
1 to 5% Al 2 O 3 ;
0 to 1% Li 2 O;
10 to 16% Na 2 O;
0 to 3% K 2 O;
0.5 to 5% MgO;
1 to 8% CaO;
0 to 1% SrO;
0 to 2% refining agent;
2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by converting all of iron compounds into Fe 2 O 3 ); and
0 to 200 ppm TiO 2 .
5. The ultraviolet ray transmitting glass composition according to claim 1 , consisting essentially of the following components, in terms of mass % or mass ppm:
60 to 70% SiO 2 ;
14 to 20% Al 2 O 3 ;
3 to 6% Li 2 O;
7 to 13% Na 2 O;
0 to 1% K 2 O;
0.5 to 3% MgO;
1 to 6% CaO;
0 to 1% SrO;
0 to 2% refining agent;
2 to 20 ppm T-Fe 2 O 3 (in which T-Fe 2 O 3 denotes a total iron oxide content obtained by converting all of iron compounds into Fe 2 O 3 ); and
0 to 200 ppm TiO 2 .
6. The ultraviolet ray transmitting glass composition according to claim 1 , wherein the content of T-Fe 2 O 3 is 2 to 10 ppm in terms of mass ppm.
7. The ultraviolet ray transmitting glass composition according to claim 6 , wherein the content of T-Fe 2 O 3 is 2 to 6 ppm in terms of mass ppm.
8. The ultraviolet ray transmitting glass composition according to claim 1 , wherein the ultraviolet ray transmitting glass composition comprises at least one component selected from the group consisting of SO 3 , Cl, and F as the refining agent, and the contents of the components, in terms of mass %, are as follows: 0 to 1% SO 3 ; 0 to 1% Cl; and 0 to 1% F.
9. The ultraviolet ray transmitting glass composition according to claim 8 , wherein the ultraviolet ray transmitting glass composition comprises SO 3 as the refining agent, and the content of SO 3 exceeds 0% but is not more than 1% in terms of mass %.
10. The ultraviolet ray transmitting glass composition according to claim 8 , wherein the ultraviolet ray transmitting glass composition comprises SO 3 as the refining agent, and the content of SO 3 is 0.01 to 1% in terms of mass %.
11. The ultraviolet ray transmitting glass composition according to claim 8 , wherein the ultraviolet ray transmitting glass composition comprises SO 3 as the refining agent, and the content of SO 3 is 0.1 to 0.5% in terms of mass %.
12. The ultraviolet ray transmitting glass composition according to claim 8 , wherein the ultraviolet ray transmitting glass composition comprises Cl as the refining agent, and the content of Cl is 0% or more but less than 0.1% in terms of mass %.
13. The ultraviolet ray transmitting glass composition according to claim 1 , wherein the ultraviolet ray transmittance is at least 70%.
14. The ultraviolet ray transmitting glass composition according to claim 13 , wherein the ultraviolet ray transmittance is at least 80%.
15. The ultraviolet ray transmitting glass composition according to claim 1 , wherein the content of FeO that is converted to Fe 2 O 3 in T-Fe 2 O 3 is at least 31%.
16. The ultraviolet ray transmitting glass composition according to claim 1 , wherein the ultraviolet ray transmitting glass composition has an average linear thermal expansion coefficient in a range of 50 to 350° C. of 80 to 100×10 −7 /° C.
17. A glass article making use of an ultraviolet ray transmitting glass composition, wherein the ultraviolet ray transmitting glass composition is an ultraviolet ray transmitting glass composition according to claim 1 .
18. The glass article according to claim 17 , wherein the glass article is a bioanalytical device.