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A temperature resistant vitreous inorganic fiber having a use temperature of up to at least 1000�� C., or greater, having after service mechanical integrity, is non-durable (soluble) in physiological fluids, and is produced from a melt containing silica, magnesia, a lanthanide series element-contain

A temperature resistant vitreous inorganic fiber having a use temperature of up to at least 1000�� C., or greater, having after service mechanical integrity, is non-durable (soluble) in physiological fluids, and is produced from a melt containing silica, magnesia, a lanthanide series element-containing compound, and optionally zirconia.

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We claim: 1. A low shrinkage, high temperature resistant vitreous inorganic fiber having a use temperature up to at least 1000�� C. or greater, which maintains mechanical integrity up to the use temperature and which is non-durable in physiological fluids, comprising the fiberization product of gre

We claim: 1. A low shrinkage, high temperature resistant vitreous inorganic fiber having a use temperature up to at least 1000�� C. or greater, which maintains mechanical integrity up to the use temperature and which is non-durable in physiological fluids, comprising the fiberization product of greater than 71.25 weight percent silica, magnesia, and a lanthanide series element-containing compound. 2. The fiber of claim 1, wherein said lanthanide series element is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. 3. The fiber of claim 2, wherein said lanthanide series element is La. 4. The fiber of claim 1, wherein said lanthanide series element-containing compound is selected from the group consisting of lanthanide series element-containing bromides, lanthanide series element-containing chlorides, lanthanide series element-containing fluorides, lanthanide series element-containing phosphates, lanthanide series element-containing nitrates, lanthanide series element-containing nitrites, lanthanide series element-containing oxides, and lanthanide series element-containing sulfates. 5. The fiber of claim 4, wherein said lanthanide series element-containing compound is La2O3. 6. The fiber of claim 1, further comprising from 0 to about 11 weight percent zirconia. 7. The fiber of claim 1, containing less than about 2 weight percent alumina. 8. The fiber of claim 1, containing less than about 1 weight percent iron oxide, calculated as Fe2O3. 9. The fiber of claim 1, containing substantially no alkali metal oxide. 10. The fiber of claim 1, containing less than about 1 weight percent calcia. 11. The fiber of claim 1, comprising the fiberization product of greater than 71.25 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 12. The fiber of claim 11, wherein said lanthanide series element is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. 13. The fiber of claim 12, wherein said lanthanide series element is La. 14. The fiber of claim 11, wherein said lanthanide series element-containing compound is selected from the group consisting of lanthanide series element-containing bromides, lanthanide series element-containing chlorides, lanthanide series element-containing fluorides, lanthanide series element-containing phosphates, lanthanide series element-containing nitrates, lanthanide series element-containing nitrites, lanthanide series element-containing oxides, and lanthanide series element-containing sulfates. 15. The fiber of claim 14, wherein said lanthanide series element-containing compound is La2O3. 16. The fiber of claim 11, further comprising from 0 to about 11 weight percent zirconia. 17. The fiber of claim 11, containing less than about 2 weight percent alumina. 18. The fiber of claim 11, containing less than about 1 weight percent iron oxide, calculated as Fe2O3. 19. The fiber of claim 11, containing substantially no alkali metal oxide. 20. The fiber of claim 11, containing less than about 1 weight percent calcia. 21. The fiber of claim 1, comprising the fiberization product of greater than 71.25 to about 86 weight percent silica, about 14 to about 28.75 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 22. The fiber of claim 21, wherein said lanthanide series element is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. 23. The fiber of claim 22, wherein said lanthanide series clement is La. 24. The fiber of claim 21, wherein said lanthanide series element-containing compound is selected from the group consisting of lanthanide series element-containing bromides, lanthanide series element-containing chlorides, lanthanide series element-containing fluorides, lanthanide series element-containing phosphates, lanthanide series element-containing nitrates, lanthanide series element-containing nitrites, lanthanide series element-containing oxides, and lanthanide series element-containing sulfates. 25. The fiber of claim 24, wherein said lanthanide series element-containing compound is La2O3. 26. The fiber of claim 21, further comprising from 0 to about 11 weight percent zirconia. 27. The fiber of claim 21, containing less than about 2 weight percent alumina. 28. The fiber of claim 21, containing less than about 1 weight percent iron oxide, calculated as Fe2O3. 29. The fiber of claim 21, containing substantially no alkali metal oxide. 30. The fiber of claim 21, containing less than about 1 weight percent calcia. 31. The fiber of claim 21, comprising fiberization product of about 72 to about 79 weight percent silica, about 21 to about 28 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 32. The fiber of claim 31, wherein said lanthanide series element is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. 33. The fiber of claim 32, wherein said lanthanide series element is La. 34. The fiber of claim 31, wherein said lanthanide series element-containing compound is selected from the group consisting of lanthanide series element-containing bromides, lanthanide series element-containing chlorides, lanthanide series element-containing fluorides, lanthanide series element-containing phosphates, lanthanide series element-containing nitrates, lanthanide series element-containing nitrites, lanthanide series element-containing oxides, and lanthanide series element-containing sulfates. 35. The fiber of claim 34, wherein said lanthanide series element-containing compound is La2O3. 36. The fiber of claim 31, further comprising from 0 to about 11 weight percent zirconia. 37. The fiber of claim 31, containing less than about 2 weight percent alumina. 38. The fiber of claim 31, containing less than about 1 weight percent iron oxide, calculated as Fe2O3. 39. The fiber of claim 31, containing substantially no alkali metal oxide. 40. The fiber of claim 31, containing less than about 1 weight percent calcia. 41. A method for preparing a low shrinkage, high temperature resistant vitreous fiber having a use temperature up to at least 1000�� C. or greater, which maintains mechanical integrity up to the use temperature and which is non-durable in physiological fluids, comprising forming a melt with ingredients comprising greater than 71.25 weight percent silica, magnesia, and a lanthanide series element-containing compound; and producing fibers from the melt. 42. The method of claim 41, wherein the melt comprises from greater than 71.25 to about 86 weight percent silica, about 14 to about 35 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 43. The method of claim 41, wherein the melt comprises from about 71.25 to about 86 weight percent silica, about 14 to about 28.75 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 44. The method of claim 43, wherein the melt comprises from about 72 to about 79 weight percent silica, about 21 to about 28 weight percent magnesia, and greater than 0 to about 6 weight percent of a lanthanide series element-containing compound. 45. The method of claim 41, wherein said lanthanide series element is selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y. 46. The method of claim 45, wherein said lanthanide series element is La. 47. The method of claim 41, wherein said lanthanide series element-containing compound is selected from the group consisting of lanthanide series element-containing bromides, lanthanide series element-containing chlorides, lanthanide series element-containing fluorides, lanthanide series element-containing phosphates, lanthanide series element-containing nitrates, lanthanide series element-containing nitrites, lanthanide series element-containing oxides, and lanthanide series element-containing sulfates. 48. The method of claim 47, wherein said lanthanide series element-containing compound is La2O3. 49. The method of claim 41, further comprising from 0 to about 11 weight percent zirconia. 50. The method of claim 41, containing less than about 2 weight percent alumina. 51. The method of claim 41, containing less than about 1 weight percent iron oxide, calculated as Fe2O3. 52. The method of claim 41, containing substantially no alkali metal oxide. 53. The method of claim 41, containing less than about 1 weight percent calcia. 54. A method of insulating an article, including disposing on, in, near or around the article, a thermal insulation material having a service temperature up to at least 1000�� C., or greater, which maintains mechanical integrity up to the use temperature and which is non-durable in physiological fluids, said insulation material comprising the fiberization product of a melt of ingredients comprising greater than 71.25 weight percent silica, magnesia, a compound containing lanthanum or a lanthanide series element and, optionally, zirconia.