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A low shrinkage, high temperature resistant vitreous inorganic fiber having a use temperature up to at least 1330° C., which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids, is prepared by the method of forming a melt with ingredi

A low shrinkage, high temperature resistant vitreous inorganic fiber having a use temperature up to at least 1330° C., which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids, is prepared by the method of forming a melt with ingredients including greater than 71.25 weight percent silica, 0 to about 20 weight percent magnesia, and about 5 to about 28.55 weight percent of calcia, 0 to about 5 weight percent zirconia, and optionally a viscosity modifier in an amount effective to render the product fiberizable; and producing fibers from the melt.

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1. A low shrinkage, high temperature resistant inorganic fiber having a maximum use temperature up to 1330° C. or greater, which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids, comprising the fiberization product of greater than

1. A low shrinkage, high temperature resistant inorganic fiber having a maximum use temperature up to 1330° C. or greater, which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids, comprising the fiberization product of greater than 71.25 to about 85 weight percent silica, greater than 0 to about 20 weight percent magnesia, about 5 to about 28.75 weight percent calcia, 0 to about 5 weight percent zirconia, and optionally a viscosity modifier in an amount effective to render the product fiberizable, wherein the fiber contains substantially no alkali metal oxide greater than trace impurities.2. The fiber of claim 1, wherein the fiber comprises the fiberization product of about 71.5 to about 79 weight percent silica, greater than 0 to about 16.5 weight percent magnesia, about 9 to about 27 weight percent calcia, and 0 to about 4.6 weight percent zirconia.3. The fiber of claim 1 wherein the fiber comprises the fiberization product of about 71.5 to about 76.1 weight percent silica, about 9.25 to about 28 weight percent calcia, greater than 0 to about 16.5 weight percent magnesia, and 0 to about 4.6 zirconia.4. The fiber of claim 1 wherein the fiber comprises the fiberization product of about 72 to about 75 weight percent silica, greater than 0 to about 16.5 weight percent magnesia and about 9.25 to about 28 weight percent calcia.5. The fiber of claim 1 wherein the fiber comprises the fiberization product of about 72 to about 79 weight percent silica, greater than 0 to about 1 weight percent magnesia, about 18 to about 27 weight percent calcia, and 0 to about 4.6 weight percent zirconia.6. The fiber of claim 1 wherein the fiber comprises the fiberization product of about 72 to about 75 weight percent silica, about 8 to about 12.5 weight percent magnesia, and about 12.5 to about 18 weight percent calcia.7. The fiber of claim 1 wherein the fiber comprises the fiberization product of about 72.5 to about 73 weight percent silica, about 3 to about 4 weight percent magnesia, and about 22 to about 23 weight percent calcia.8. The fiber of claim 1 wherein the fiber comprises the fiberization product of greater than about 71.25 weight percent silica, about 1.75 to about 10.75 weight percent magnesia, and about 18 to about 27 weight percent calcia.9. The fiber of claim 1 wherein the fiber comprises the fiberization product of greater than about 71.5 weight percent silica, about 7.15 to about 10.65 weight percent magnesia, and about 17.85 to about 21.35 weight percent calcia.10. The fiber of claim 1 wherein the fiber comprises the fiberization product of greater than about 78.5 weight percent silica, about 5.38 to about 8.05 weight percent magnesia, and about 13.45 to about 16.12 weight percent calcia.11. The fiber of claim 1 containing up to about 1.5 weight percent iron oxide calculated as Fe2O3.12. The fiber of claim 11, containing up to about 1.15 weight percent iron oxide calculated as Fe2O3.13. The fiber of claim 1 containing up to about 3.5 weight percent alumina.14. The fiber of claim 13 containing up to about 2.5 weight percent alumina.15. The fiber of claim 13 containing up to about 1.5 weight percent alumina.16. The fiber of claim 1 wherein said fiber exhibits a linear shrinkage of less than about 5% at 1260° C. for 24 hours.17. The fiber of claim 1 wherein said fiber exhibits a linear shrinkage of about 20% or less at 1330° C. for 24 hours.18. The fiber of claim 1 wherein said fiber demonstrates a recovery of at least about 5% after 50% compression following exposure to a service temperature of 1260° C.19. A high temperature resistant fiber containing article selected from the group consisting of bulk fiber, blankets, needled blankets, papers, felts, cast shapes, vacuum cast forms, and compositions, said article comprising the fiber of any of claims 1 to 18.20. A process for the production of low shrinkage, high temperature resistant fiber having a maximum use temperature up to 1330° C. or greater, which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids, including forming a melt with ingredients comprising greater than about 71.25 to about 85 weight percent silica, greater than 0 to about 20 weight percent magnesia, about 5 to about 28.75 weight percent calcia, 0 to about 5 weight percent zirconia, and optionally a viscosity modifier in an amount effective to render the product fiberizable; and wherein the melt contains substantially no alkali metal oxide greater than trace impurities; and producing fibers from the melt.21. The process of claim 20 wherein the ingredients of the melt comprise about 71.5 to about 79 weight percent silica, greater than 0 to about 16.5 weight percent magnesia, about 9 to about 27 weight percent calcia, and 0 to about 4.6 weight percent zirconia.22. The process of claim 20 wherein the ingredients of the melt comprise about 71.5 to about 76.1 weight percent silica, greater than 0 to about 16.5 weight percent magnesia, about 9.25 to about 28 weight percent calcia and 0 to about 4.6 weight percent zirconia.23. The process of claim 20 wherein the ingredients of the melt comprise about 72 to about 75 weight percent silica, greater than 0 to about 16.5 weight percent magnesia and about 9.25 to about 28 weight percent calcia.24. The process of claim 1 wherein the ingredients of the melt comprise about 72 to about 79 weight percent silica, greater than 0 to about 1 weight percent magnesia, about 18 to about 27 weight percent calcia, and 0 to about 4.6 weight percent zirconia.25. The process of claim 20 wherein the ingredients of the melt comprise about 72 to about 75 weight percent silica, about 8 to about 12.5 weight percent magnesia, and about 12.5 to about 18 weight percent calcia.26. The process of claim 20 wherein the ingredients of the melt comprise about 72.5 to about 73 weight percent silica, about 3 to about 4 weight percent magnesia, and about 22 to about 23 weight percent calcia.27. The process of claim 20 wherein the ingredients of the melt comprise greater than about 71.25 weight percent silica, about 1.75 to about 10.75 weight percent magnesia, and about 18 to about 27 weight percent calcia.28. The process of claim 20 wherein the ingredients of the melt comprise greater than about 71.5 weight percent silica, about 7.15 to about 10.65 weight percent magnesia, and about 17.85 to about 21.35 weight percent calcia.29. The process of claim 20 wherein the ingredients of the melt comprise about 78.5 weight percent silica, about 5.38 to about 8.05 weight percent magnesia, and about 13.45 to about 16.12 weight percent calcia.30. The process of claim 20 wherein the ingredients of the melt contain up to about 1.5 weight percent iron oxide calculated as Fe2O3.31. The process of claim 20 wherein the ingredients of the melt contain up to about 1.15 weight percent iron oxide calculated as Fe2O3.32. The process of claim 31 wherein the ingredients of the melt contain up to about 3.5 weight percent alumina.33. The process of claim 32 wherein the ingredients of the melt contain up to about 2.5 weight percent alumina.34. The process of claim 32 wherein the ingredients of the melt contain up to about 1.5 weight percent alumina.35. The process of claim 20 including spinning the fibers from the melt.36. The process of claim 20 including blowing the fibers from the melt.37. A low shrinkage, high temperature resistant inorganic fiber having a maximum use temperature up to 1330° C. or greater, which maintains mechanical integrity after exposure to the use temperature and which is non-durable in physiological fluids prepared in accordance with any one of claims 20 to 36.38. A method of insulating an article, including disposing on, in, near or around the article, a thermal insulation material having a maximum service temperature of 1330° C. or greater, said insulation material comprising the fiber of any one of claims 1 to 18.39. The fiber of claim 1 comprising the fiberization product of greater than 71.25 to about 85 weight percent silica, greater than 10 to about 20 weight percent magnesia, about 5 to about 18.75 weight percent calcia, 0 to about 5 weight percent zirconia, and optionally a viscosity modifier in an amount effective to render the product fiberizable.40. The fiber of claim 39 containing up to about 1.5 weight percent iron oxide calculated as Fe2O3.41. The fiber of claim 39 containing up to about 3.5 weight percent alumina.42. The fiber of claim 39 containing substantially no alkali metal oxide greater than trace impurities.43. The fiber of claim 39 wherein said fiber exhibits a linear shrinkage of less than about 5% at 1260° C. for 24 hours.44. The fiber of claim 39 wherein said fiber exhibits a linear shrinkage of about 20% or less at 1330° C. for 24 hours.45. The fiber of claim 39 wherein said fiber demonstrates a recovery of at least about 5% after 50% compression following exposure to a service temperature of 1260° C.46. A high temperature resistant fiber containing article selected from the group consisting of bulk fiber, blankets, needled blankets, papers, felts, cast shapes, vacuum cast forms, and compositions, said article comprising the fiber of claim 39.47. A method of insulating an article, including disposing on, in, near or around the article, a thermal insulation material having a maximum service temperature of 1330° C. or greater, said insulation material comprising the fiber of claim 39.48. The fiber of claim 1 comprising the fiberization product of greater than 71.25 to about 85 weight percent silica, greater than 0 to about 20 weight percent magnesia, greater than 5 to about 14 weight percent calcia, 0 to about 5 weight percent zirconia, substantially no alkali metal oxide greater than trace impurities, and optionally a viscosity modifier in an amount effective to render the product fiberizable.49. The fiber of claim 48 containing up to about 1.5 weight percent iron oxide calculated as Fe2O3.50. The fiber of claim 48 containing up to about 3.5 weight percent alumina.51. The fiber of claim 48 containing up to about 2.5 weight percent alumina.52. The fiber of claim 48 wherein said fiber exhibits a linear shrinkage of less than about 5% at 1260° C. for 24 hours.53. The fiber of claim 48 wherein said fiber exhibits a linear shrinkage of about 20% or less at 1330° C. for 24 hours.54. The fiber of claim 48 wherein said fiber demonstrates a recovery of at least about 5% after 50% compression following exposure to a service temperature of 1260° C.55. A high temperature resistant fiber containing article selected from the group consisting of bulk fiber, blankets, needled blankets, papers, felts, cast shapes, vacuum cast forms, and compositions, said article comprising the fiber of claim 48.56. A method of insulating an article, including disposing on, in, near or around the article, a thermal insulation material having a maximum service temperature of 1330° C. or greater, said insulation material comprising the fiber of claim 48.