The performance of conductive inks, particularly graphene nanoplatelet (GNP) hybrid formulations which silver (Ag) and zinc (Z), is strongly influenced by their electrical, mechanical, thermal, and surface properties. Evaluating these characteristics is crucial for understanding their suitability in flexible electronics, semiconductor packaging, and other emerging applications where reliability under operational stress is essential. This chapter presents a comprehensive assessment of the GNPs hybrid conductive ink through a series of characterisation techniques designed to quantify its functional and structural behaviour.