| http://www.w3.org/ns/prov#value | - There is still further provided a composite membrane as described above; wherein said composite membrane is able to withstand temperatures of up to 450??? C. without suffering any significant impairment of its permeability or selectivity, and said composite membrane is substantially free of pin holes, microcracks, or other defects which can significantly impair said permeability and/or selectivity
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