FIELD: filtering of various gases and liquids applicable in semiconductor industry. SUBSTANCE: two types of finely divided powder of polytetrafluoroethylene with average molecular mass of one of them differing from the other minimum by 1000000 is mixed with liquid smeary substance and loaded in layers into extruder mold. Then, it is pressed through extruder. Produced extrudate is rolled and drawn. Introduced additionally in one of mixtures of powder with smearing substance is nonfiber-forming low-molecular polytetrafluoroethylene. After rolling, smearing substance may be removed by thermal drying. EFFECT: higher efficiency. 3 cl, 2 dwg, 2 tbl
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