Glass compositions with improved chemical and mechanical durability

1. A glass for pharmaceutical packaging having a glass composition comprising:

from about 70 mol. % to about 80 mol. % SiO 2 ;

from about 4 mol. % to about 8 mol. % alkaline earth oxide, the alkaline earth oxide comprising MgO and CaO;

X mol. % Al 2 O 3 , wherein X is from 4 to about 8; and

Y mol. % alkali oxide comprising non-zero amounts of Na 2 O and K 2 O, wherein a concentration of K 2 O is from 0.01 to less than 2, Y is about 9-15 mol. % and a ratio of Y:X is greater than 1.

2. The glass for pharmaceutical packaging of claim 1 , wherein the SiO 2 is present in an amount from about 74 mol. % to about 78 mol. %.

3. The glass for pharmaceutical packaging of claim 1 , wherein the alkaline earth oxide comprises a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is less than or equal to 0.5.

4. The glass for pharmaceutical packaging of claim 1 , wherein the alkaline earth oxide comprises from about 0.1 mol. % to about 1.0 mol. % CaO.

5. The glass for pharmaceutical packaging of claim 1 , wherein a ratio of Y:X is less than or equal to 2.

6. The glass for pharmaceutical packaging of claim 5 , wherein the alkali oxide comprises Na 2 O in an amount greater than 8 mol. %.

7. The glass for pharmaceutical packaging of claim 1 , wherein the glass composition is free of boron and compounds of boron.

8. The glass for pharmaceutical packaging of claim 1 , wherein the glass has a type HGB1 hydrolytic resistance according to ISO 719.

9. The glass for pharmaceutical packaging of claim 1 , wherein the glass has at least a class S3 acid resistance according to DIN 12116.

10. The glass for pharmaceutical packaging of claim 1 , wherein the glass has at least a class A2 base resistance according to ISO 695.

11. The glass of claim 1 , wherein a coefficient of thermal expansion of the glass is less than 70×10 −7 K −1 .

12. The glass for pharmaceutical packaging of claim 1 , wherein the glass is ion exchange strengthened and has a compressive stress layer with a depth of layer greater than or equal to 10 μm and a surface compressive stress greater than or equal to 250 MPa.

13. The glass for pharmaceutical packaging of claim 12 , wherein the glass has a type HGA1 hydrolytic resistance according to ISO 720 before and after ion exchange strengthening.

14. A glass for pharmaceutical packaging having a glass composition comprising:

from about 74 mol. % to about 80 mol. % SiO 2 ;

alkaline earth oxide comprising MgO and CaO and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is greater than 0 and less than or equal to 0.5 and the CaO is from 0.1 to about 1.0 mol. %;

X mol. % Al 2 O 3 , wherein X is from about 4 to about 8; and

Y mol. % alkali oxide comprising non-zero amounts of Na 2 O and K 2 O, wherein Y is greater than about 8 mol. %, a ratio of Y:X is greater than or equal to 1, and a ratio of a concentration of B 2 O 3 (mol. %) to (Y mol. %-X mol. %) is less than or equal to 0.3.

15. The glass for pharmaceutical packaging of claim 14 , wherein the alkaline earth oxide comprises from about 3 mol. % to about 7 mol. % MgO.

16. The glass for pharmaceutical packaging of claim 14 , wherein a ratio of Y:X is less than or equal to 2.

17. The glass for pharmaceutical packaging of claim 14 , wherein the alkali oxide comprises Na 2 O in an amount greater than 8 mol. %.

18. The glass for pharmaceutical packaging of claim 14 , wherein the glass composition is free of boron and compounds of boron.

19. The glass for pharmaceutical packaging of claim 14 , wherein the glass is ion exchange strengthened and has a compressive stress layer with a depth of layer greater than or equal to 10 μm and a surface compressive stress greater than or equal to 250 MPa.

20. The glass for pharmaceutical packaging of claim 14 , wherein the glass has a type HGB1 hydrolytic resistance according to ISO 719.

21. The glass of claim 14 , wherein a coefficient of thermal expansion of the glass is less than 70×10 −7 K −1 .

22. A glass for pharmaceutical packaging having a glass composition comprising:

from about 70 mol. % to about 80 mol. % SiO 2 ;

from about 4 mol. % to about 8 mol. % alkaline earth oxide comprising MgO and CaO and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is greater than 0 and less than or equal to 0.5,

X mol. % Al 2 O 3 ; and

Y mol. % alkali oxide comprising non-zero amounts of Na 2 O and K 2 O, wherein Y is about 9-14 mol. %, a ratio of Y:X is greater than or equal to 1 and less than or equal to 2, and a ratio of a concentration of B 2 O 3 (mol. %) to (Y mol. %-X mol. %) is less than or equal to 0.3.

23. The glass for pharmaceutical packaging of claim 22 , wherein the alkaline earth oxide comprises from about 3 mol. % to about 7 mol. % MgO and from about 0.1 mol. % to about 1.0 mol. % CaO.

24. The glass for pharmaceutical packaging of claim 22 , wherein the alkali oxide comprises Na 2 O in an amount greater than 8 mol. %.

25. The glass of claim 22 , wherein a coefficient of thermal expansion of the glass is less than 70×10 −7 K −1 .

26. A glass for pharmaceutical packaging having a glass composition comprising:

from about 70 mol. % to about 80 mol. % SiO 2 ;

alkaline earth oxide comprising MgO and CaO and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %))) is greater than 0 and less than or equal to 0.5;

X mol. % Al 2 O 3 , wherein X is from about 6 to about 8; and

Y mol. % alkali oxide comprising non-zero amounts of Na 2 O and K 2 O, wherein Y is from about 9 mol. % to about 15 mol. %.

27. The glass for pharmaceutical packaging of claim 26 , wherein the alkali oxide comprises Na 2 O in an amount greater than 8 mol. %.

28. The glass of claim 26 , wherein a coefficient of thermal expansion of the glass is less than 70×10 −7 K −1 .