Powders with constant morphology and quality are essential for reproducible ceramic manufacturing. This study characterizes in terms of microstructure some commercially available powders and selects them for the reproducible manufacture of membranes using via sequential tape casting. The composition of the slurry was systematically varied in order to obtain planar and defect-free green tape, suitable for a large-scale production process. The debinding and sintering parameters were optimized to obtain defect-free membranes with reduced curvature. The crucial parameters are the heating ramp, the sintering temperature and the duration. The study investigated the microstructure of the asymmetric membranes, characterized by a porosity of the support of approximately 35% and a thickness of the membrane layer of approximately 20 μm. The microstructure and oxygen permeation are comparable to those of asymmetric La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O _3-δ (LSCF) membranes made with powders specifically designed for tape casting, showing an oxygen flux > 1 mL×cm ⁻² ×min at 900 °C in an air/Ar gradient.