1 filtering materials; namely, hydrophilic and synthetic micro-filtration and ultra-filtration membranes fo ruse in the filtration of liquids in the fields of biotechnology, dairy products, manufacture of pharmaceutics and cosmetics, the flavor industry, manure treatment, waste water treatment, cold sterilization, thickening, concentration, effluent polishing, beer and wine ultrafiltration, emulsion splitting and acetic acid filtration