The fluorine-containing elastomer constituent and the sealant null which then

摘要

Being the containing fluorine elastomer composition which offers the containing fluorine elastomer composition where the compression permanent deformation is small, (a) content of the perfluoro alkyl vinyl ether unit 18 - 33 mols %, (b) content of the monomer unit which at least possesses 1 where it is chosen from the group which consists of the nitrile basis, the carboxyl group and the alkoxy carbonyl group kinds 0.3 - 0.6 mols % and (perfluoro elastomer it possesses c) tetrafluoroethylene unit is the containing fluorine elastomer composition which (A) is included.