A membrane has a coating layer with a hydrophobicity, expressed as gamma, of 35-45 mN/m. Pref. the hydrophobicity is 39-41 mN/m. The membrane is of polypropylene, and the coating is of a mixt. of polyamide and polystyrene pref. in ratio of 4-10:1 (6-8:1) or a mixt. of polystyrene and polymethyl methacrylate, pref. in ratio of 1:4-7 (1:5-6). The thickness of the membrane is not above 5 (0.1-0.5) microns.
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