Glass compositions, fiberizable glass compositions, and glass fibers made therefrom

1. A glass composition suitable for fiber forming comprising:

SiO 2 from 44.5 to 64 weight percent;

Al 2 O 3 from 12 to 32 weight percent;

CaO from 0.1 to 15.5 weight percent;

MgO from 5 to 22 weight percent;

Fe 2 O 3 less than 1 weight percent;

TiO 2 less than 2 weight percent;

Na 2 O less than 3 weight percent;

ZnO up to 4 weight percent;

Li 2 O less than 0.1 weight percent;

F 2 is present in an amount up to 0.02 weight percent;

RE 2 O 3 up to 12 weight percent; and

B 2 O 3 less than 4.5 weight percent.

2. The glass composition of claim 1 , wherein RE 2 O 3 comprises at least one of Y 2 O 3 or CeO 2 .

3. The glass composition of claim 2 , wherein CeO 2 is present in an amount up to 6 weight percent.

4. The glass composition of claim 1 , wherein a total (SiO 2 +Al 2 O 3 ) content is greater than 70 weight percent.

5. The glass composition of claim 1 , wherein a ratio of Al 2 O 3 to RO (Al 2 O 3 /RO) is less than 5, wherein RO is a total (CaO+MgO+ZnO) content.

6. The glass composition of claim 1 , wherein a total (MgO+CaO) content ranges from 6 to 24 weight percent.

7. The glass composition of claim 1 , wherein a ratio of CaO to MgO, (CaO/MgO), is less than 2.0.

8. The glass composition of claim 1 , wherein a ratio of RE 2 O 3 to MgO (RE 2 O 3 /MgO) is less than 1.5.

9. The glass composition of claim 1 , wherein the composition is substantially free of B 2 O 3 .

10. A plurality of glass fibers formed from the glass composition of claim 1 .

11. The plurality of glass fibers of claim 10 , wherein the glass fibers have a Young's modulus greater than 86 GPa.

12. The plurality of glass fibers of claim 10 , wherein the glass fibers have a density less than 2.8 g/cm 3 .

13. The plurality of glass fibers of claim 10 , wherein the glass fibers have a Specific modulus of greater than 3.2×10 6 m.

14. The plurality of glass fibers of claim 10 , wherein the glass fibers have a Specific modulus greater than 3.40 (10 6 m).

15. The plurality of glass fibers of claim 10 , wherein the glass fibers can be drawn at a fiber actual drawing temperature (T F actual ) of at least 60° C. above a liquidus temperature (T L ) of the glass fibers.

16. The plurality of glass fibers of claim 10 , wherein the glass fibers have a liquidus temperature (T L ) of less than 1380° C.

17. The plurality of glass fibers of claim 10 , wherein the glass fibers have a melting temperature (T M ) of less than 1550° C.

18. A fiber glass strand comprising the plurality of glass fibers of claim 10 .

19. A roving comprising the plurality of glass fibers of claim 10 .

20. A yarn comprising the plurality of glass fibers of claim 10 .

21. A woven fabric comprising the plurality of glass fibers of claim 10 .

22. A non-woven fabric comprising the plurality of glass fibers of claim 10 .

23. A chopped fiber glass strand comprising the plurality of glass fibers of claim 10 .

24. A polymeric composite comprising:

a polymeric material; and

a plurality of glass fibers formed from the glass composition of claim 1 .

25. The polymeric composite of claim 24 , wherein the plurality of glass fibers are in the form of a non-woven fabric or a unidirectional fabric.

26. The polymeric composite of claim 24 , wherein the plurality of glass fibers are in the form of a woven fabric.

27. The polymeric composite of claim 24 , wherein the polymeric material comprises a thermoplastic polymer.

28. The polymeric composite of claim 24 , wherein the polymeric material comprises a thermosetting polymer.

29. An article of manufacture comprising a plurality of glass fibers formed from the glass composition of claim 1 .