| http://www.w3.org/ns/prov#value | - stituted by an alcohol with the weight of said solvent lying between three times and twenty times the weight of the zirconium alcoholate; impregnating said aluminum membrane structure and its optional macroporous support with said zirconiferous solution in such a manner as to cause the pores of said structure to be filled with said solution; and progressively baking said impregnated structure so a
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