A number of industrial processes, such as particle removal from gases by filtration and gas injection by porous plugs in steel refining, makes use of rigid and porous ceramic products through which fluid now at high temperature takes place, The correct design and proper structure of such a membrane can save an appreciable amount of energy in the process, as the pressure drop due to fluid flow and membrane clogging are minimized. However, the number of experimental works found in the literature on this subject is still scarce, particularly in the applications concerning gas filtration at high temperatures, In this work, the formation and characterization of rigid refractory membranes with foam-like structure is carried out, These ceramic bodies were formed by impregnating an uniform polyurethane foam with a suspension of refractory raw materials, followed by drying and calcination. The membranes structural characteristics are correlated to its permeability to air now, with gas superficial velocity varying from 2 to 12 cm/s, which are typical values for gas filtration. The results indicate a very high dependence of porosity to the permeability of rigid ceramic membrane for gas flow.