High efficiency synthetic filter medium

Details High efficiency synthetic filter medium High efficiency synthetic filter medium

1998-09-03

2000-09-26

Chiesa, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

55524, 55528, 55DIG5, 55DIG39, 264DIG48, 442 88, B03C 328

Patent

active

061237523

ABSTRACT:
A high efficiency filtration medium comprised of a nonwoven filter web of electret charged fibers of a nonconductive thermoplastic resin having a resistivity greater than 10.sup.14 ohm-cm, preferably polypropylene. The nonwoven filter web has a basis weight (BW) of less than 60 grams/m.sup.2, an effective fiber diameter (EFD) of less than 5 microns and a penetration (PEN) of less than 0.03%, wherein the ratio);

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