Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20440
Title: In vivo protective performance of N95 respirator and surgical facemask
Authors: Li, Y 
Wong, T
Chung, J
Guo, YP
Hu, JY
Guan, YT
Yao, L
Song, QW
Newton, E
Keywords: Efficiency
Filter
H5N1
Influenza A
Mask
N95 respirator
Nano-functional materials
Permeability
SARS
Surgical mask
Issue Date: 2006
Publisher: Wiley-Liss
Source: American journal of industrial medicine, 2006, v. 49, no. 12, p. 1056-1065 How to cite?
Journal: American Journal of Industrial Medicine 
Abstract: Background: The SARS outbreak in 2003 has spawned a major controversy concerning protective performance facemasks for healthcare workers. This study reports a study on in-vivo protective performance of surgical masks and N95 respirators. Methods: Typical surgical masks and N95 respirators used in Hong Kong hospitals were tested in comparison with those treated with nano-functional materials (called nano-masks) on various physical properties and in-vivo wear filtration efficiency, as well as usability test in hospitals for surgical masks. Results: Tests on physical properties showed that N95 respirators had significantly lower air permeability and water vapor permeability than surgical masks. The in-vivo filtration tests illustrated that N95 respirators filtered out 97% of potassium chloride (KCl) solution, while surgical masks filtered out 95% of KCl solution. Nano-masks show stronger water repellency and antibacterial activities, but no difference in usability, comparing with normal N95 and surgical masks. Conclusions: Surgical masks can provide in-vivo filtration protection of 95% filtration efficiency. N95 respirators provide higher in-vivo filtration efficiency of 97% with significant reduction of air permeability and water vapor permeability. Compared to normal surgical masks/respirators, the nano-masks can provide additional protective functions in stopping capillary diffusion and antibacterial activities.
URI: http://hdl.handle.net/10397/20440
ISSN: 0271-3586
DOI: 10.1002/ajim.20395
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