curable fluoropolyether rubber composition : this composition comprises a straight chain fluoropolyether compound having at least two alkenyl groups in its molecule and having a divalent perfluoropolyether structure in its backbone chain , a polytetrafluoroethylene , an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in its molecule , and a hydrosilylation reaction catalyst . the composition is provided in the form of a paste capable of forming into optional shapes , and its cured product is well - balanced in and is excellent in properties such as heat resistance , chemical resistance , solvent resistance , releasability , lubricating qualities , water repellency , oil repellency and weatherability .