POLYELECTROLYTE FUEL CELL-USE SEPARATOR, POLYELECTROLYTE FUEL CELL, METHOD OF EVALUATING POLYELECTROLYTE FUEL CELL-USE SEPARATOR, AND PRODUCTION METHOD OF POLYELECTROLYTE FUEL CELL-USE SEPARATOR

摘要

A separator for a polymer electrolyte fuel cell, which contains electrically conductive carbon and a binder that binds the electrically conductive carbon, comprises a reaction gas passage formed on at least a main surface thereof, wherein a water droplet falling angle of a surface the reaction gas passage is not less than 5 degrees and not more than 45 degrees when a water droplet of not less than 50 µ L and not more than 80 µ L is dropped under a condition in which ambient temperature is not lower than 50°C and not higher than 90°C and relative humidity is not less than 70% and not more than 100%.