NOVELTY - A fiber (110) has polymer material including poly(aryl ether ketone)s; blends of poly(aryl ether ketone) and poly(aryl ether sulfone); poly(biphenyl ether sulfone)s; poly(aryl ether sulfone)s other than poly(biphenyl ether sulfone)s; polyamide-imides; polyarylenes; poly(imide sulfone)s; blends of poly(arylene sulfide) and poly(aryl ether sulfone); and/or blends of poly(biphenyl ether sulfone) and poly(aryl ether sulfone) other than poly(biphenyl ether sulfone).    USE - The fiber is used in fabric (120) for filter assembly (100) useful in filtration system for coal burning power generation plant and cement plant (claimed). The fabric may be used in textile industry and aerospace, automotive, medical, military, safety, chemical, pharmaceutical, and metallurgical industries. The fiber may be used in flame resistant materials, fire blocking felts, gaskets, hoses, belts, ropes, rechargeable battery separators, sterilizable fabrics, geotextile, threads, composite filler materials, dust collectors, pollution control systems, and mist eliminator blades or baffles, such as those within an absorber tower. Flame resistant textiles may be used for environmentally aggressive environments, chemical handling, hazardous waste, radiation, tear resistance, impact resistance, protective fabrics, carpets, bedding, and upholstery.    ADVANTAGE - The fiber can provide alternative source of material to address limited supply of conventional materials used in industrial filter assemblies, which need to be periodically replaced. It can provide filter assembly that can sustain high operating temperatures and acidic environments. Poly(biphenyl ether sulfone) fibers do not breakdown oxidatively, thus improving longevity of the filter assembly, and do not clog up as quickly and need not be replaced as frequently.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for making the fiber comprising forming greater than or equal to 100 strands of polymer material in a matrix of another polymer material different from the polymer material, all totaling greater than or equal to 2 mu m in number average diameter, and washing away the other matrix polymer material to obtain as many nanofibers as the number of strands formed in the matrix.    DESCRIPTION OF DRAWING(S) - The drawing is a front view of the filter assembly including fibers.    Filter assembly (100)    Fiber (110)    Fabric (120)    Support rings (130)    Flange (140)