Ceramic composite asymmetric microporous membranes were prepared for Micro- and Ultra-Filtration. The characterisation of their microporous separative layers was made by the nitrogen adsorption method, gas permeability measurements and SEM observations. This was connected with the characterisation of the corresponding composite substrates, as regards their morphology, structure and permeability. Certain anomalies, related to the intrinsic gas permeability of those separative layers, were observed in connection with the texture of their surface. These rough surfaces might play an important role in filtration or in gas separation processes. In order to evaluate a surface correction factor further studies are envisaged.
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