RUBBER COMPOSITION FOR SOLID HIGH POLYMER FUEL CELL SEPARATOR, SEALING MATERIAL USING THE SAME, AND SOLID HIGH POLYMER FUEL CELL SEPARATOR

摘要

PROBLEM TO BE SOLVED: To obtain a sealing material which ca be used for a long period, and is useful for sealing material of a solid high polymer fuel cell separator, and superior in acid resistance, weather resistance, creep resistance, and gas permeability. SOLUTION: The rubber composition sealing at least a single circumference edge of the solid high polymer fuel cell separator includes the following components (A)-(D): (A) a polysobutylenpolymer having an allyl group to at least a single end; (B) an organopolysiloxane indicated by a mean composition formula: R<1> n SiO(4-n)/2 ; (C) an organohydrogenpolysiloxane having at least 2 hydrogen atoms coupled with a silicon atom in one molecule; (D) a platinum group metallic catalyst. The sealing material for the solid high polymer fuel cell separator is obtained by curing the rubber composition.