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An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the ran

An abradable seal comprises a plurality of hollow aluminosilicate spheres in a matrix of aluminium phosphate. The matrix of aluminium phosphate also has an aluminosilicate filler. The hollow aluminosilicate spheres have a diameter in the range of 400 to 1800 microns, preferably a diameter in the range of 800 to 1400 microns. The weight proportion of hollow aluminosilicate spheres in the abradable seal is 30% to 50%. The density of the abradable seal is 1.5 grammes per cubic centimetre. The hollow aluminosilicate spheres in the aluminium phosphate matrix have a relatively high temperature capability of approximately 1300.degree. C. maximum. This makes the abradable seal better able to withstand the environment in the turbine of a turbofan gas turbine engine.

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[ We claim:] [1.] An abradable composition comprising:hollow aluminosilicate spheres having a diameter in the range of 400 to 1800 microns, andan aluminium phosphate matrix,the hollow aluminosilicate spheres being arranged in the aluminium phosphate matrix, the weight proportion of hollow aluminosil

[ We claim:] [1.] An abradable composition comprising:hollow aluminosilicate spheres having a diameter in the range of 400 to 1800 microns, andan aluminium phosphate matrix,the hollow aluminosilicate spheres being arranged in the aluminium phosphate matrix, the weight proportion of hollow aluminosilicate spheres being 30% to 50%. [5.] A gas turbine engine having a component, the component comprising a ceramic matrix composite material, the ceramic matrix composite material comprising reinforcing fibers in a ceramic matrix material,an abradable seal being arranged on the component, the abradable seal being bonded to the component, the abradable seal comprising hollow aluminosilicate spheres having a diameter in the range 400 to 1800 microns and an aluminum phosphate matrix, the hollow aluminosilicate spheres being arranged in the aluminum phosphate matrix, the weight proportion of hollow aluminosilicate spheres being 30% to 50%.