NOVELTY - A fluorine-containing curable composition contains (in parts mass) linear perfluoropolyether compound (100) having at least two alkenyl groups in a molecule, fluorine-containing organosilicon compound having at least two hydrogen atoms coupled with silicon atom in a molecule, hydrosilylation reaction catalyst, silica-type filler (1-100) and thermoplastic fluororesin (1-100) having melting point of 100-200 degrees C. The linear perfluoropolyether compound comprises perfluoropolyether structure having fluorocarbon-containing repeating unit (I) in principal chain.    USE - Fluorine-containing curable composition is used for rubber component for motor vehicles, chemical apparatus and chemical processing plant. Uses include but are not limited to diaphragm for fuel regulator, diaphragm for pulsation damper, valve for canister, O-ring for injector, gasket for cylinder head, hose, coating material, potting material for sensor, sealing material for fuel cell and roll material for copier.    ADVANTAGE - The fluorine-containing curable composition has low viscosity. The cured material containing the fluorine-containing curable composition has excellent heat resistance, chemical resistance, solvent resistance and mechanical strength, and reduced fuel oil permeability.    DETAILED DESCRIPTION - A fluorine-containing curable composition contains (in parts mass) linear perfluoropolyether compound (100) having at least two alkenyl groups in a molecule and number average molecular weight of 3000-100000, fluorine-containing organosilicon compound having at least two hydrogen atoms coupled with silicon atom in a molecule, hydrosilylation reaction catalyst, silica-type filler (1-100) and thermoplastic fluororesin (1-100) having melting point of 100-200 degrees C. The linear perfluoropolyether compound comprises perfluoropolyether structure having fluorocarbon-containing repeating unit of formula: -CaF2aO- (I) in principal chain. The molar ratio of silane group in fluorine-containing organosilicon compound and alkenyl group in linear perfluoropolyether compound is 0.4-5.    a=1-6.    An INDEPENDENT CLAIM is included for manufacture of fluorine-containing curable composition, which involves add-mixing linear perfluoropolyether compound, fluorine-containing organosilicon compound, hydrosilylation reaction catalyst, silica-type filler and thermoplastic fluororesin.