This chapter presents a comprehensive investigation into the electrical, structural, and compositional characteristics of graphene nanoplatelet (GNP) based conductive ink developed for flexible electronic applications. The primary objective of this chapter is to evaluate the baseline GNPs formulation and to determine the optimal conditions required to achieve stable electrical conductivity while maintaining structural integrity within the polymer matrix. The conductive ink system examined in this chapter consists of GNPs dispersed within an epoxy resin binder, where the conductive fillers play a critical role in establishing continuous electrical pathways throughout the composite material.