Special Issue on COVID-19 Aerosol Drivers, Impacts and Mitigation (VII)

Haoxian Lu1, Dawen Yao1, Joanne Yip2, Chi-Wai Kan2, Hai Guo This email address is being protected from spambots. You need JavaScript enabled to view it.1

1 Air Quality Studies, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
2 Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong, China


 

Received: June 1, 2020
Revised: August 9, 2020
Accepted: September 9, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.06.0275  


Cite this article:

Lu, H., Yao, D., Yip, J., Kan, C.W. and Guo, H. (2020). Addressing COVID-19 Spread: Development of Reliable Testing System for Mask Reuse. Aerosol Air Qual. Res. 20: 2309–2317. https://doi.org/10.4209/aaqr.2020.06.0275


HIGHLIGHTS

  • A system for testing Particle Filtration Efficiency of face masks was developed.
  • Reusable face masks were developed to overcome the shortage of masks.
  • Particle Filtration Efficiencies of different face masks were tested.
  • Key factors for a high PFE were indicated.
 

ABSTRACT 


While the novel coronavirus pandemic (COVID-19) continues to wreak havoc globally, self-protection from possible infection by wearing a mask in daily life has become the norm in many places. The unprecedented demand for masks has now attracted attention on their filtration efficiency. Furthermore, the widespread use of disposable masks has led to shortage of filter materials and problems with their haphazard disposal. In this study, a testing system that is based on standardized methods has been established and enhanced to reliably measure the particle filtration efficiency (PFE) of masks. Quality control experiments that examine the filtration efficiency of polystyrene latex (PSL) particles that are 0.1 µm in size and sodium chloride (NaCl) particles that range from 0.01–1.0 µm are conducted to determine the reliability of the testing system. Moreover, various textile materials are tested to fabricate 3-layer face masks, and the PFE of these masks is tested by using the proposed testing system to find the most suitable materials and the likelihood of their reusability. Among the tested materials, polytetrafluoroethylene (PTFE) used as the membrane in the filter layer has the highest PFE of 88.33% ± 1.80%, which is mainly due to its dense and multilayer structure. The air permeability of the self-developed masks ranges from 1.41 ± 0.04 to 1.93 ± 0.08, less breathable than the commercial masks. The reusability of a mask that uses PTFE as the membrane in the filter layer is tested by gently washing the mask 30 times and then drying the mask in air before the PFE is measured. The PFE is only reduced by 10–20% after 30 washes, thus indicating the potential reusability of the mask. The findings in this study will contribute to reducing the pressure of mask shortages and are an environmentally friendly solution to the massive use of disposable masks.


Keywords: COVID-19; Mask testing system; Reusable mask; Particle filtration efficiency.




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