NOVELTY - Cross-linkable fluoro rubber composition contains specific polymer compound (A) (in mass parts) (100), fluorine-containing elastomer cured particles (B) (10-300) and peroxide cross-linking agent (C) (0.1-10). The compound (A) has viscosity of 1000 Pa.second or more at 25degreesC. The particles (B) have average particle diameter of 0.001-200 microns.    USE - For rubber components, such as diaphragm, valve (for power control and canisters), O-ring (for injectors, fluid piping and quick connectors), oil seal, gasket, packing, joint and face seal, for motor vehicles, chemical processing plants, inkjet printers, semiconductor production line, physics and chemistry machines, medical machines, aircrafts, fuel cells (all claimed). Diaphragm is used for fuel regulators, pulsation dampers, oil pressure indicator lamp switches and EGR. Also used for tent film material, shaping components, extrusion components, copier roll material, moisture-proof coating material for electricity, potting material for sensors and jet fuel.    ADVANTAGE - The cured material of the fluoro rubber composition has excellent solvent resistance, chemical resistance, weather resistance, heat resistance, oil repellent property, low temperature characteristics, hydrofluoric acid-proof property and water repellent property.    DETAILED DESCRIPTION - Cross-linkable fluoro rubber composition contains polymer compound (A) (in mass parts) (100), fluorine-containing elastomer cured particles (B) (10-300) and peroxide cross-linking agent (C) (0.1-10). The compound (A) is given by formula: Z-(Rf-Q)n-Rf-Z.    n=integer greater than 0;    Rf=divalent perfluoro alkylene group or perfluoro oxyalkylene group;    Q=divalent organic group;and    Z=monovalent organic group.    The compound (A) has viscosity of 1000 Pa.second or more at 25degreesC. The particles (B) have average particle diameter of 0.001-200 microns. An INDEPENDENT CLAIM is included for rubber components which has fluoro rubber cured material formed by curing the fluoro rubber composition.