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Evaluation of Respirator Filters for Asbestos Fibers. Final Performance Report.

PB97105209

Publication Date	1996
Personal Author	Cheng, Y. S.; Fan, B.; Holmes, T. D.; Yeh, H. C.
Page Count	56
Abstract	The effects of fiber dimensions, flow rate, and charge status of filter cartridges on the penetration of fiber aerosols were examined, using four types of test respirator filters (two for passive respirators, one for a powered respirator, and one disposal respirator). Some filters were charged to enhance the collection efficiency. Only high efficiency filters performed consistently for both spherical test aerosols and the three types of asbestos (1332214) fibers. The performance of these filters did not appear to be changed by the surface charge potential of filter cartridges and charge status of fibers. When the change potential on the filter was removed and/or fiber aerosols discharged, the performance of low efficiency filters and masks deteriorated for aerosols. The surface charges decreased in a high temperature, high humidity environment and disappeared after 1 week. Shorter fibers had higher penetration rates indicating the fiber interception is an important deposition mechanism.
Keywords	Respirators Protective equipment Occupational safety and health Filters Asbestos Fibers Fibrous dusts Airborne particles
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68G - Environmental Health & Safety 94H - Industrial Safety Engineering
Corporate Authors	Lovelace Biomedical and Environmental Research Inst., Albuquerque, NM. Inhalation Toxicology Research Inst.; Department of Energy, Washington, DC.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH. and Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	199701
Contract Number	DE-AC04-76EV01013

Evaluation of Respirator Filters for Asbestos Fibers. Final Performance Report.

Evaluation of Respirator Filters for Asbestos Fibers. Final Performance Report.
PB97105209

Publication Date	1996
Personal Author	Cheng, Y. S.; Fan, B.; Holmes, T. D.; Yeh, H. C.
Page Count	56
Abstract	The effects of fiber dimensions, flow rate, and charge status of filter cartridges on the penetration of fiber aerosols were examined, using four types of test respirator filters (two for passive respirators, one for a powered respirator, and one disposal respirator). Some filters were charged to enhance the collection efficiency. Only high efficiency filters performed consistently for both spherical test aerosols and the three types of asbestos (1332214) fibers. The performance of these filters did not appear to be changed by the surface charge potential of filter cartridges and charge status of fibers. When the change potential on the filter was removed and/or fiber aerosols discharged, the performance of low efficiency filters and masks deteriorated for aerosols. The surface charges decreased in a high temperature, high humidity environment and disappeared after 1 week. Shorter fibers had higher penetration rates indicating the fiber interception is an important deposition mechanism.
Keywords	Respirators Protective equipment Occupational safety and health Filters Asbestos Fibers Fibrous dusts Airborne particles
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 68G - Environmental Health & Safety 94H - Industrial Safety Engineering
Corporate Authors	Lovelace Biomedical and Environmental Research Inst., Albuquerque, NM. Inhalation Toxicology Research Inst.; Department of Energy, Washington, DC.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH. and Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	199701
Contract Number	DE-AC04-76EV01013