TY - JOUR
T1 - Can sterilization of disposable face masks be an alternative for imported face masks? A nationwide field study including 19 sterilization departments and 471 imported brand types during COVID-19 shortages
AU - van Straten, B.
AU - Robertson, P. D.
AU - Oussoren, H.
AU - Pereira Espindola, S.
AU - Ghanbari, E.
AU - Dankelman, J.
AU - Picken, S.
AU - Horeman, T.
N1 - Publisher Copyright: © 2021 van Straten et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
PY - 2021/9/1
Y1 - 2021/9/1
N2 - Background Face masks, also referred to as half masks, are essential to protect healthcare professionals working in close contact with patients with COVID-19-related symptoms. Because of the Corona material shortages, healthcare institutions sought an approach to reuse face masks or to purchase new, imported masks. The filter quality of these masks remained unclear. Therefore, the aim of this study was to assess the quality of sterilized and imported FFP2/ KN95 face masks. Methods A 48-minute steam sterilization process of single-use FFP2/KN95 face masks with a 15 minute holding time at 121∘C was developed, validated and implemented in the Central Sterilization Departments (CSSD) of 19 different hospitals. Masks sterilized by steam and H2O2 plasma as well as new, imported masks were tested for particle filtration efficiency (PFE) and pressure drop in a custom-made test setup. Results The results of 84 masks tested on the PFE dry particle test setup showed differences of 2.3 ±2% (mean±SD). Test data showed that the mean PFE values of 444 sterilized FFP2 face masks from the 19 CSSDs were 90±11% (mean±SD), and those of 474 new, imported KN95/FFP2 face masks were 83±16% (mean±SD). Differences in PFE of masks received from different sterilization departments were found. Conclusion Face masks can be reprocessed with 121 ∘C steam or H2O2 plasma sterilization with a minimal reduction in PFE. PFE comparison between filter material of sterilized masks and new, imported masks indicates that the filter material of most reprocessed masks of high quality brands can outperform new, imported face masks of unknown brands. Although the PFE of tested face masks from different sterilization departments remained efficient, using different types of sterilization equipment, can result in different PFE outcomes.
AB - Background Face masks, also referred to as half masks, are essential to protect healthcare professionals working in close contact with patients with COVID-19-related symptoms. Because of the Corona material shortages, healthcare institutions sought an approach to reuse face masks or to purchase new, imported masks. The filter quality of these masks remained unclear. Therefore, the aim of this study was to assess the quality of sterilized and imported FFP2/ KN95 face masks. Methods A 48-minute steam sterilization process of single-use FFP2/KN95 face masks with a 15 minute holding time at 121∘C was developed, validated and implemented in the Central Sterilization Departments (CSSD) of 19 different hospitals. Masks sterilized by steam and H2O2 plasma as well as new, imported masks were tested for particle filtration efficiency (PFE) and pressure drop in a custom-made test setup. Results The results of 84 masks tested on the PFE dry particle test setup showed differences of 2.3 ±2% (mean±SD). Test data showed that the mean PFE values of 444 sterilized FFP2 face masks from the 19 CSSDs were 90±11% (mean±SD), and those of 474 new, imported KN95/FFP2 face masks were 83±16% (mean±SD). Differences in PFE of masks received from different sterilization departments were found. Conclusion Face masks can be reprocessed with 121 ∘C steam or H2O2 plasma sterilization with a minimal reduction in PFE. PFE comparison between filter material of sterilized masks and new, imported masks indicates that the filter material of most reprocessed masks of high quality brands can outperform new, imported face masks of unknown brands. Although the PFE of tested face masks from different sterilization departments remained efficient, using different types of sterilization equipment, can result in different PFE outcomes.
UR - http://www.scopus.com/inward/record.url?scp=85114861548&partnerID=8YFLogxK
U2 - https://doi.org/10.1371/journal.pone.0257468
DO - https://doi.org/10.1371/journal.pone.0257468
M3 - Article
C2 - 34520503
SN - 1932-6203
VL - 16
JO - PLOS ONE
JF - PLOS ONE
IS - 9 September 2021
M1 - e0257468
ER -