SORPTION-FILTER MEDIUM, GAS FILTER, QUANTITATIVE SORPTION-FILTER PAPER AND FILTERING HALF-MASK ON GAS FILTER BASE FOR PROTECTION OF RESPIRATORY ORGANS Russian patent published in 2002 - IPC

FIELD: gas filtering. SUBSTANCE: invention describes sorption-filter three-layer fibrous material whose middle layer is made of ultrathin perchlorovinyl fibers containing particles of active coal treated with silver nitrate. External layers are made of mixture of perchlorovinyl sized ultrathin fibers with diameter of 5-9 mcm and diameter of 0.5-1.2 mcm. Articles are proposed on base of said material: filters for gas cleaning, quantitative filter paper and filtering half-masks. EFFECT: higher operating and protective characteristics (filtering and sorption) of material and articles on its base, particularly, from radioactive molecular iodine. 4 cl, 3 dwg, 1 tbl, 5 ex