Binder selection and formulation play a crucial role in the metal injection moulding process. They are essential for controlling the rheological properties of the feedstock and determining its suitability for successful injection moulding, debinding, and sintering without defects. To achieve this, a four-step process was employed, involving the blending of SS 316L and Carbon Nanotube powders with a binder system based on High-Density Polyethylene (HDPE). The rheological properties of the resulting homogeneous feedstock, such as flow behavior index, flow activation energy, fluidity, and melt flow index, were evaluated using a capillary rheometer. All feedstock formulations exhibited a shear thinning flow behavior. The optimal feedstock composition, consisting of 60 vol.% powder content, 32 vol.% HDPE, 6 vol.% Paraffin wax, and 2 vol.% stearic acid, proved suitable for metal injection moulding of SS316L-CNTcomposite materials.