Fluororubber composition, and a method of manufacturing

A not only heat resistance, provides a method for producing a fluororubber composition which gives a crosslinked product having excellent mechanical properties at high temperature. The A closed-type mixer, until a maximum temperature reached 80 to 220 ° C., by kneading the fluororubber (A) and carbon black (B), and to obtain an intermediate composition (1-1), and step (1-2) for cooling the intermediate composition to below 50 ° C., to a maximum temperature reached to below 80 ° C. 10 ° C. or higher, and kneading the cooled intermediate composition, to obtain a fluororubber composition method for producing a fluororubber composition comprising a (2-1), the. .FIELD 1