PACKING MATERIAL FOR SOLID POLYMER FUEL CELL SEPARATOR

摘要

PROBLEM TO BE SOLVED: To provide a packing material maintaining elasticity for a long period and excellent in durability by using a material which is made of additive liquid silicone obtained by bridge-reacting two liquids different in structure and has a specific density after bridging. SOLUTION: A packing material covering at least a one-side peripheral edge section of the separator of a solid polymer fuel cell is formed with additive liquid silicone obtained by bridge-reacting a liquid A expressed by formula I and a liquid B expressed by formula II. In the formula I, m+n=50-2000. In the formula II, m'+n'=8-98. The bridge density by the pulse NMR method after bridging is set within the range of 0.3-5.0%. An alloy catalyst is normally used for the catalyst when two liquids A, B are mixed. Injection molding or press molding is used for molding the packing material. When a metal sheet such as a stainless steel sheet is used for a separator main body, the metal thin sheet is held in a die and a resin is injected by the insert molding method.