A filtration material comprising a blend of at least two types of fibers: (a) polypropylene fibers and (b) either acrylic or modacrylic fibers. In a preferred embodiment, the blend contains about 50 weight percent polypropylene fibers and about 50 weight percent modacrylic fibers. In another preferred...http://www.google.es/patents/US7434698?utm_source=gb-gplus-sharePatente US7434698 - Two fiber filtration material
