| http://www.w3.org/ns/prov#value | - The thickness of the non-porous membrane layer prepared by means of the present process is preferably from 0.05 to 100 ??m (i.e. 5???10-8 to 10-4 m), and in particular from 0.1 to 10 ??m, in order to have sufficient permeability for at least one compound to be separated from a fluid mixture by permeation through the membrane layer, while still possessing sufficient strength to bridge the pores of
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