FILTERING ELEMENT FOR FOLDED FILTER OF DUST RESPIRATOR Russian patent published in 1995 - IPC

FIELD: individual protective means. SUBSTANCE: filtering element has a layer of polymer superthin fibers, underlying material and a base. Underlying material is manufactured of fabric which contains lavsan (82-98 mass % ) and propylene (2-18 mass %), surface density of fibers being 25-30 g/m². Mentioned above base is manufactured of fabric which contains polyamide (50-60 mass % ) and lavsan (40-50 mass %), surface density of fibers being 35-40 g/m². Air permeability of underlying element and of base is at least 1200 dm³/m²·c. Diameter of superthin fibers is 1.0-8.0 μm, content of fibers with diameter 1.0-2.5 μm being 60-70 mass %, content of fibers with diameter 2.6-8.0 μm being 30-40 mass %. EFFECT: increases quality of filtering element.