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Exploring Reusability of Disposable Face Masks: Effects of Disinfection Methods on Filtration Efficiency, Breathability, and Fluid Resistance
Global Challenges ( IF 4.4 ) Pub Date : 2021-07-28 , DOI: 10.1002/gch2.202100030
Jye Yng Teo 1 , Jessica Kng 1 , Balamurugan Periaswamy 1 , Songlin Liu 2 , Poh-Chong Lim 2 , Chen Ee Lee 3 , Ban Hock Tan 4, 5 , Xian Jun Loh 2 , Xiping Ni 2 , Daniel Tiang 3 , Guangshun Yi 1 , Yee Yian Ong 3 , Moi Lin Ling 5 , Wei Yee Wan 3 , Hei Man Wong 4, 5 , Molly How 3 , Xiaohui Xin 3 , Yugen Zhang 1 , Yi Yan Yang 1
Affiliation  

To curb the spread of the COVID-19 virus, the use of face masks such as disposable surgical masks and N95 respirators is being encouraged and even enforced in some countries. The widespread use of masks has resulted in global shortages and individuals are reusing them. This calls for proper disinfection of the masks while retaining their protective capability. In this study, the killing efficiency of ultraviolet-C (UV-C) irradiation, dry heat, and steam sterilization against bacteria (Staphylococcus aureus), fungi (Candida albicans), and nonpathogenic virus (Salmonella virus P22) is investigated. UV-C irradiation for 10 min in a commercial UV sterilizer effectively disinfects surgical masks. N95 respirators require dry heat at 100 °C for hours while steam treatment works within 5 min. To address the question on safe reuse of the disinfected masks, their bacteria filtration efficiency, particle filtration efficiency, breathability, and fluid resistance are assessed. These performance factors are unaffected after 5 cycles of steam (10 min per cycle) and 10 cycles of dry heat at 100 °C (40 min per cycle) for N95 respirators, and 10 cycles of UV-C irradiation for surgical masks (10 min per side per cycle). These findings provide insights into formulating the standard procedures for reusing masks without compromising their protective ability.

中文翻译:

探索一次性口罩的可重复使用性:消毒方法对过滤效率、透气性和流体阻力的影响

为了遏制 COVID-19 病毒的传播,一些国家鼓励甚至强制使用一次性外科口罩和 N95 呼吸器等口罩。口罩的广泛使用导致全球口罩短缺,人们正在重复使用它们。这就需要对口罩进行适当消毒,同时保留其防护能力。在本研究中,研究了紫外线 C (UV-C) 照射、干热和蒸汽灭菌对细菌(金黄色葡萄球菌)、真菌(白色念珠菌)和非致病性病毒(沙门氏菌病毒 P22 )的杀灭效率。在商用紫外线消毒器中 UV-C 照射 10 分钟可有效消毒外科口罩。N95 呼吸器需要 100°C 的干热持续数小时,而蒸汽处理可在 5 分钟内发挥作用。为了解决消毒后口罩的安全重复使用问题,评估了其细菌过滤效率、颗粒过滤效率、透气性和流体阻力。N95 口罩经过 5 个蒸汽循环(每个循环 10 分钟)和 10 个 100 °C 干热循环(每个循环 40 分钟)后,以及外科口罩经过 10 个 UV-C 照射循环(10 分钟)后,这些性能因素不受影响。每个周期每面)。这些发现为制定重复使用口罩的标准程序提供了见解,同时又不影响其防护能力。
更新日期:2021-07-28
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