Electret filter media

Details Electret filter media Electret filter media

1997-05-29

2000-09-19

Weiss, Jr., Joseph

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

12820529, 55DIG35, 55DIG39, A62B 1802, A62B 2302, A62B 710

Patent

active

061196916

ABSTRACT:
An electret filter media, and mask, that is made of a nonwoven web of thermoplastic microfibers. The thermoplastic microfibers are of substantially the same composition, are nonconductive, and have an effective fiber diameter less than about 15 micrometers. The nonwoven web also has sufficient unpolarized trapped charge to exhibit an initial filtration quality factor of at least 0.31 when measured under the DOP Penetration and Pressure Drop Test.

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