Laminate

A laminate comprising a rubber layer (A) and a fluororesin layer (B) on the rubber layer (A),

• wherein the rubber layer (A) is a layer made of a rubber composition for vulcanization,
• the rubber composition for vulcanization contains an unvulcanized rubber (a1) which is acrylonitrile-butadiene rubber or its hydride;
• at least one compound (a2) selected from the group consisting of a 1,8-diazabicyclo(5.4.0)undec-7-ene salt, a 1,5-diazabicyclo(4.3.0)-non-5-ene salt, 1,8-diazabicyclo(5.4.0)undec-7-ene, and 1,5-diazabicyclo(4.3.0)-non-5-ene;
• magnesium oxide (a3);
• and silica (a4),
• the amount of the compound (a2) is larger than 1.0 part by mass and not larger than 5.0 parts by mass, for each 100 parts by mass of the unvulcanized rubber (a1),
• the amount of the magnesium oxide (a3) is 3 to 20 parts by mass, for each 100 parts by mass of the unvulcanized rubber (a1),
• the amount of the silica (a4) is 10 to 40 parts by mass for each 100 parts by mass of the unvulcanized rubber (a1),
• the fluororesin layer (B) is a layer made of a fluoropolymer composition, and
• the fluoropolymer composition contains a fluoropolymer (b1) which is chlorotrifluoroethylene copolymer,
• wherein the chlorotrifluoroethylene copolymer contains only a chlorotrifluoroethylene unit, tetrafluoroethylene unit and perfluoro(alkylvinylether) unit,
• the ratio between the chlorotrifluoroethylene unit and the tetrafluoroethylene unit in the chlorotrifluoroethylene copolymer is chlorotrifluoroethylene unit/tetrafluoroethylene unit =15-90/85-10 (mol %),
• the amount of the perfluoro(alkylvinylether) unit is not smaller than 0.5 mol % and not larger than 5 mol % of all the monomer units.