FIELD: filtration engineering. SUBSTANCE: liquid film is formed on substrate consisting of solution containing 20-40% of trifluorochloroethylene copolymer with 20-30% of vinylidene fluoride and 5-16% of pore-former (lower alcohol, acetone, or methylpyrrolidone) in dimethylacetamide, tetrahydrofuran, or ethyl acetate. Film id further hardened. Filter can be used for tangential filtration of liquid mixtures, concentration and separation thereof, and purification of their components. EFFECT: prevented bulge formation and increased cracking resistance. 1 tbl, 6 ex
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