Ni-GDC cermet tubes (~3 mm inside diameter, 0.3–0.4 mm wall thickness and ∼100 mm in length) with different amounts of porosity have been prepared by sintering of NiO-Ce 0.9 Gd 0.1 O 1.95 (NiO-GDC) nanopowders and further reduction. The NiO-GDC nanopowders were synthesized by chemical route and the different pore density was obtained by modifying the processing conditions (calcining and adjustment of carbonous remains).Ni-GDC cermets were obtained from the sintered NiO-GDC composites using reduction treatment at 700 °C for 3 h in reducing atmosphere (5 vol.% H 2 –95 vol.% Ar). After the reduction process, tubes with 25–32% porosity were obtained. Gas permeability and Hg porosimetry studies were used to evaluate permeability, pore distribution and pore density. Electrical conductivity studies of the cermets were also performed.