The invention relates to a module element comprising a high-temperature resistant base, said high-temperature resistant base having at least one metal or ceramic bottom that has at least one through-passage for introducing a ceramic capillary membrane, and at least one potting that is formed as a sufficiently gas-tight and high-temperature resistant connection between the metal or ceramic bottom and the at least one ceramic capillary membrane. The at least one through-opening of the at least one metal or ceramic bottom has an enlarged portion on at least one side of the metal or ceramic bottom for accommodating the sufficiently gas-tight and high-temperature resistant connection.