NOVELTY - The hardenable fluoro polyether rubber composition contains linear fluoro polyether compound (A) (100 mass parts) having two alkenyl groups, organosilicon compound (B) having at least two hydrogen atom bonded to silicon atom, alumina powder (C) (1-200 mass parts) of average particle diameter 1 microns of less, and hydrosilylation reaction catalyst (D).    USE - For rubber products such as diaphragm (for fuel regulator, pulsation dampers, oil pressure indicator lamps, EGR), valve (for canisters and power control), O-ring for quick connectors, oil seal, gasket for cylinder heads, packing joint, face seal used for motor vehicles, chemical processing plants, ink-jet printers, semiconductor production lines, physical-and-chemical analyzing components, medical components, sealant for fuel cells and aircraft use (all claimed) (O-rings for fluid piping, jet fuel), tent film material, sealant, molding components, extrusion components, coating material, copier roll material, moisture-proof coating material for electrical products, potting agent for sensors, and lamination rubber cloth.    ADVANTAGE - The hardenable fluoro polyether rubber composition provides rubber products with excellent heat resistance, chemical resistance, solvent resistance, water repellent property, oil repellent property, weather resistance and high strength. Cured material with excellent release property especially metallic mold release property, and compression permanent deformation characteristics, is provided.    DETAILED DESCRIPTION - The hardenable fluoro polyether rubber composition contains linear fluoro polyether compound (A) (100 mass parts) having per fluoro polyether structure in principal chain and having two alkenyl groups in one molecule, organosilicon compound (B) having at least two hydrogen atom bonded to silicon atom, alumina powder (C) (1-200 mass parts) of average particle diameter 1 microns of less, and hydrosilylation reaction catalyst (D). The amount of silicon-hydrogen group of (B) is 0.5-5 mol with respect to 1 mol or alkenyl group of (A). An INDEPENDENT CLAIM is included for the rubber products containing the cured material of hardenable fluoro polyether type rubber composition.