Glass compositions with improved chemical and mechanical durability
The embodiments described herein relate to chemically and mechanically durable glass compositions and glass articles formed from the same. In another embodiment, a glass composition may include from about 70 mol. % to about 80 mol. % SiO 2 ; from about 3 mol. % to about 13 mol. % alkaline earth oxide; X mol. % Al 2 O 3 ; and Y mol. % alkali oxide. The alkali oxide may include Na 2 O in an amount greater than about 8 mol. %. A ratio of Y:X may be greater than 1 and the glass composition may be free of boron and compounds of boron. In some embodiments, the glass composition may also be free of phosphorous and compounds of phosphorous. Glass articles formed from the glass composition may have at least a class S3 acid resistance according to DIN 12116, at least a class A2 base resistance according to ISO 695, and a type HGA1 hydrolytic resistance according to ISO 720.
1. A glass container comprising:
SiO 2 in an amount greater than or equal to about 72 mol. % and less than or equal to about 78 mol. %;
X mol. % Al 2 O 3 , wherein X is greater than or equal to about 5 mol. % and less than or equal to about 7 mol. %;
Y mol. % alkali oxide, wherein the alkali oxide comprises Na 2 O in an amount greater than about 8 mol. %; and
MgO and CaO, wherein CaO is present in an amount up to about 1.0 mol. % and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is less than or equal to 0.5; and
a hydrolytic resistance of at least HGB2 according to ISO 719, wherein a ratio of a concentration of B 2 O 3 (mol. %) in the glass container to (Y mol. %−X mol. %) is less than or equal to 0.3.
2. The glass container of claim 1 , wherein a ratio of Y:X is greater than 1.
3. The glass container of claim 2 , wherein a ratio of Y:X is less than 2.
4. The glass container of claim 1 , further comprising from about 4 mol. % to about 8 mol. % alkaline earth oxide.
5. The glass container of claim 1 , wherein the container has a hydrolytic resistance of at least HGA2 according to ISO 720.
6. The glass container of claim 1 wherein the glass container is ion-exchange strengthened.
7. The glass container of claim 6 further comprising a compressive stress layer with a depth of layer greater than 10 μm.
8. The glass container of claim 6 further comprising a surface compressive stress greater than or equal to 350 MPa.
9. The glass container of claim 1 , wherein the glass container is free of boron and compounds of boron.
10. The glass container of claim 1 , wherein the glass container is a pharmaceutical package.
11. The glass container of claim 1 , wherein the glass container comprises less than or equal to about 13 mol. % Na 2 O.
12. The glass container of claim 1 , wherein the glass container comprises greater than or equal to about 0.01 mol. % and less than or equal to about 4 mol. % B 2 O 3 .
13. A glass container comprising:
greater than or equal to about 72 mol. % and less than or equal to about 78 mol. % SiO 2 ;
greater than or equal to about 4 mol. % and less than or equal to about 8 mol. % alkaline earth oxide, wherein the alkaline earth oxide comprises both MgO and CaO and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is less than or equal to 0.5;
X mol. % Al 2 O 3 , wherein X is greater than or equal to about 5 mol. % and less than or equal to about 7 mol. %; and
Y mol. % alkali oxide, wherein the alkali oxide comprises Na 2 O in an amount greater than or equal to about 8 mol. %, wherein:
the glass container has a threshold diffusivity of greater than 16 μm 2 /hr at a temperature less than or equal to 450° C., and a ratio of a concentration of B 2 O 3 (mol. %) in the glass container to (Y mol. %−X mol. %) is less than or equal to 0.3.
14. The glass container of claim 13 further comprising greater than or equal to about 0.01 mol. % and less than or equal to about 4 mol. % B 2 O 3 .
15. The glass container of claim 13 , wherein the glass container is free from boron and compounds of boron.
16. The glass container of claim 13 , wherein the glass container has a compressive stress layer with a depth of layer greater than 10 μm.
17. The glass container of claim 13 , wherein the glass container has a surface compressive stress greater than or equal to 250 MPa.
18. The glass container of claim 13 , wherein the threshold diffusivity is greater than 20 μm 2 /hr at a temperature less than or equal to 450° C.
19. The glass container of claim 13 , wherein the glass container has a hydrolytic resistance of at least HGA2 according to ISO 720.
20. The glass container of claim 13 , wherein the glass container is a pharmaceutical package.
21. A glass container comprising:
greater than or equal to about 72 mol. % and less than or equal to about 78 mol. % SiO 2 ;
alkaline earth oxide comprising both CaO and MgO, wherein CaO is present in an amount up to about 1.0 mol. %, and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is less than or equal to 0.5;
X mol. % Al 2 O 3 , wherein X is greater than or equal to about 5 mol. % and less than or equal to about 7 mol. %; and
Y mol. % alkali oxide, the alkali oxide comprising from about 0.01 mol. % to about 1.0 mol. % K 2 O, wherein a ratio of a concentration of B 2 O 3 (mol. %) in the glass container to (Y mol. %−X mol. %) is less than or equal to 0.3 and the glass container is a pharmaceutical package.
22. The glass container of claim 21 , wherein the glass container has a compressive stress layer with a depth of layer greater than 10 μm.
23. The glass container of claim 21 , wherein the glass container has a surface compressive stress greater than or equal to 250 MPa.
24. The glass container of claim 21 , wherein the glass container has a hydrolytic resistance of at least HGA2 according to ISO 720.
25. The glass container of claim 21 , wherein a ratio of Y:X is greater than or equal to 0.9 and less than 2.
26. The glass container of claim 21 , wherein the glass container has a threshold diffusivity of greater than 16 μm 2 /hr at a temperature less than or equal to 450° C.
27. The glass container of claim 21 , wherein the glass container is free of boron and compounds of boron.
28. The glass container of claim 21 , wherein the glass container has a hydrolytic resistance of at least HGB2 according to ISO 719.
29. The glass container of claim 21 , wherein the glass container has at least a class S3 acid resistance according to DIN 12116.
30. The glass container of claim 21 , wherein the glass container has at least a class A2 base resistance according to ISO 695.