These polypropylenes are formulated for injection molding applications that require a balance of processability and mechanical rigidity, two important considerations in achieving high filler loading, maintaining a flow path mold pattern under compression and in a cell‟s operating effectively in the fuel cell environment. Moreover, to clarify the effect of process ability on composite properties, especially electrical conductivity, polypropylenes with different melt flow rates were chosen for comparison and determination of the final properties of composites. The properties of these polymers are illustrated in Tables A1 and A2 in Appendix A.