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Thermal insulation comprises sol-gel formed fibers comprising 10 to 99 mol % of a refractory base composition, and 1 to 90 mol % of a component selected from earth metal oxides, alkali metal oxides, and mixtures thereof, and wherein said alkaline earth metal oxides if present comprise one or more of

Thermal insulation comprises sol-gel formed fibers comprising 10 to 99 mol % of a refractory base composition, and 1 to 90 mol % of a component selected from earth metal oxides, alkali metal oxides, and mixtures thereof, and wherein said alkaline earth metal oxides if present comprise one or more of calcium oxide, strontium oxide, barium oxide or a mixture thereof. The refractory base comprises SiO2 and Al2O3.

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1. Sol-gel formed fibres comprising in mol %: Al2O3 and SiO2 in such amounts that Al2O3+SiO2 is in the range of 50% to 99% and in which Al2O3 is present in amounts of at least 25 mol %; andone or more alkaline earth oxides and/or alkali metal oxides comprising in total 5%-30%, wherein the alkaline e

1. Sol-gel formed fibres comprising in mol %: Al2O3 and SiO2 in such amounts that Al2O3+SiO2 is in the range of 50% to 99% and in which Al2O3 is present in amounts of at least 25 mol %; andone or more alkaline earth oxides and/or alkali metal oxides comprising in total 5%-30%, wherein the alkaline earth metal oxide comprises one or more of calcium oxide, strontium oxide, barium oxide or a mixture thereof. 2. Thermal insulation comprising sol-gel formed fibres as claimed in claim 1. 3. Sol-gel formed fibres, as claimed in claim 1, in which Al2O3+SiO2 is in the range 65% to 95%. 4. Thermal insulation, as claimed in claim 2, in which the alkaline earth metal oxide is CaO, SrO or mixtures thereof. 5. Thermal insulation, as claimed in claim 4, in which the alkaline earth metal oxide is CaO. 6. Thermal insulation, as claimed in claim 4, in which the alkaline earth metal oxide additionally comprises magnesium oxide. 7. Thermal insulation, as claimed in claim 4, in which the amount of CaO is less than 25 mol %. 8. Thermal insulation, as claimed in claim 2, in which SiO2 is present in amounts less than 50 mol %. 9. Thermal insulation, as claimed in claim 2, in which the thermal insulation comprises alkaline earth oxides in an amount greater than 18 wt %. 10. Thermal insulation, as claimed in claim 2, in which the thermal insulation is in the form of a needled blanket. 11. Thermal insulation, as claimed in claim 2, in which the sol-gel formed fibres have a length weighted geometric mean diameter of 6 μm. 22. A fibrous body comprising sol-gel fibres as claimed in claim 1. 23. A fibrous body as claimed in claim 22, comprising additionally melt formed fibres. 24. A fibrous body, as claimed in claim 23, in which the melt formed fibres are or comprise alkaline earth silicate fibres. 25. A fibrous body as claimed in claim 22, comprising sol-gel fibres in which the fibres have a length weighted geometric mean diameter of 6 μm. 26. An exhaust system catalytic converter or diesel particulate comprising a catalyst body supported directly or indirectly by a fibrous body as claimed in claim 22. 27. A method of producing sol-gel fibres as claimed in claim 1 comprising: forming a sol comprising precursors for aluminum oxide, silicon oxide, and one or more alkaline earth oxides and/or alkali metal oxides;forming fibres from the sol by a rotary process in which the sol is flung from a rotor and then blasted by a gas which acts to dry and gel the sol to form a fibre;further drying said fibres; andfiring the resultant fibres at a temperature in excess of 900° C. to produce fibres. 28. A method, as claimed in claim 27, in which the fibres have a length weighted geometric mean diameter of 6 μm. 43. A fibrous body comprising sol-gel fibres as claimed in claim 33. 44. A fibrous body as claimed in claim 43, comprising additionally melt formed fibres. 45. A fibrous body, as claimed in claim 44, in which the melt formed fibres are or comprise alkaline earth silicate fibres. 46. An exhaust system catalytic converter or diesel particulate comprising a catalyst body supported directly or indirectly by a fibrous body as claimed in claim 43. 47. Thermal insulation comprising sol-gel formed fibres as claimed in claim 33. 48. Thermal insulation as claimed in claim 47, in which the thermal insulation is in the form of a needle blanket.