| 摘要 |
A respiratory mask 20 for protecting a wearer against airborne particulates, chemical vapors, and splashes is disclosed. The mask 20 includes a body 22 sized to fit over at least a portion of the face of a wearer. The body 22 includes a first layer 110 including a microporous membrane having a plurality of interconnecting pores extending therethrough, and a second layer 112 including an absorbent textile. The mask further includes an attachment mechanism for coupling the mask 20 to the face of the wearer. The first layer 110 may be made from several materials; one such being expanded polytetrafluoroethylene (ePTFE). The second layer 112 may be made from an activated carbon textile. The mean pore size may be between about 0.1-5.0žm. The mask may also comprise an oleophobic treatment which can comprise fluorochemical polymers. In an alternative embodiment, the mask can feature a third layer which comprises at least one fabric material. The third layer may be laminated to the microporous membrane 110, possibly achieved through use of an adhesive composition, thermal bonding or a combination of the two techniques. Air permability and moisture vapour transmission rates are also disclosed. A further invention disclosed is a filter cartridge with the two layers 110 and 112. |
