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10.1016/j.polymdegradstab.2020.109251

http://scihub22266oqcxt.onion/10.1016/j.polymdegradstab.2020.109251
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C7271865!7271865!32834203
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suck abstract from ncbi


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pmid32834203      Polym+Degrad+Stab 2020 ; 179 (ä): 109251
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  • Extended use of face masks during the COVID-19 pandemic - Thermal conditioning and spray-on surface disinfection #MMPMID32834203
  • Celina MC; Martinez E; Omana MA; Sanchez A; Wiemann D; Tezak M; Dargaville TR
  • Polym Degrad Stab 2020[Sep]; 179 (ä): 109251 PMID32834203show ga
  • The current COVID-19 pandemic has resulted in globally constrained supplies for face masks and personal protective equipment (PPE). Production capacity is limited in many countries and the future course of the pandemic will likely continue with shortages for high quality masks and PPE in the foreseeable future. Hence, expectations are that mask reuse, extended wear and similar approaches will enhance the availability of personal protective measures. Repeated thermal disinfection could be an important option and likely easier implemented in some situations, at least on the small scale, than UV illumination, irradiation or hydrogen peroxide vapor exposure. An overview on thermal responses and ongoing filtration performance of multiple face mask types is provided. Most masks have adequate material properties to survive a few cycles (i.e. 30 min disinfection steps) of thermal exposure in the 75°C regime. Some are more easily affected, as seen by the fusing of plastic liner or warping, given that preferred conditioning temperatures are near the softening point for some of the plastics and fibers used in these masks. Hence adequate temperature control is equally important. As guidance, disinfectants sprayed via dilute solutions maintain a surface presence over extended time at 25 and 37°C. Some spray-on alcohol-based solutions containing disinfectants were gently applied to the top surface of masks. Neither moderate thermal aging (less than 24 h at 80 and 95°C) nor gentle application of surface disinfectant sprays resulted in measurable loss of mask filter performance. Subject to bio-medical concurrence (additional checks for virus kill efficiency) and the use of low risk non-toxic disinfectants, such strategies, either individually or combined, by offering additional anti-viral properties or short term refreshing, may complement reuse options of professional masks or the now ubiquitous custom-made face masks with their often unknown filtration effectiveness.
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