Dense tubular self-supporting La0.7Ca0.3Fe0.85Co0.15O3-delta perovskite membranes were prepared by thermoplastic extrusion. The rheological behavior of the ceramic mixture was studied. Non-deformed tubes of 10 and 5 mm diameter and 0.3-0.8 mm wall thickness could be extruded. After sintering at 1100 degrees C, the membranes reached a relative density of over 98%, with an average grain size of 0.25 mu m. Flexural strength, elastic modulus, and fracture toughness of sintered perovskite ceramics were determined on test bars prepared by injection molding from a thermoplastic mixture identical to that used for extrusion. The room-temperature flexural strength reached 215 MPa in four-point bending, and the fracture toughness was 1.6 MPa (.) m(0.5).