The ability to disinfect and reuse disposable N95 filtering facepiece respirators (FFRs) may be needed during a pandemic of an infectious respiratory disease such as influenza. Ultraviolet germicidal irradiation (UVGI) is one possible method for respirator disinfection. However, UV radiation degrades polymers, which presents the possibility that UVGI exposure could degrade the ability of a disposable respirator to protect the worker. To study this, we exposed both sides of material coupons and respirator straps from four models of N95 FFRs to UVGI doses from 120 to 950 J/cm2. We then tested the particle penetration, flow resistance and the bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps. We found that UVGI exposure led to a small increase in particle penetration (up to 1.25%) and had little effect on the flow resistance. UVGI exposure had a more pronounced effect on the strengths of the respirator materials. At the higher UVGI doses, the strength of the layers of respirator material was substantially reduced (in some cases, by >90%). The changes in the strengths of the respirator materials varied considerably among the different models of respirators. UVGI had less of an effect on the respirator straps; a dose of 2360 J/cm2 reduced the breaking strength of the straps by 20% to 51%. Our results suggest that UVGI could be used to effectively disinfect disposable respirators for reuse, but the maximum number of disinfection cycles will be limited by the respirator model and the UVGI dose required to inactivate the pathogen.
ok，你说的对，我没看仔细上面贴的这段。暂时不知道这段摘要的来源，等我有空再查可信度。 顺带贴一些cdc的文章，链接在这里：https://www.cdc.gov/niosh/nioshtic-2/20045956.html 摘要： The ability to disinfect and reuse disposable N95 filtering facepiece respirators (FFRs) may be needed during a pandemic of an infectious respiratory disease such as influenza. Ultraviolet germicidal irradiation (UVGI) is one possible method for respirator disinfection. However, UV radiation degrades polymers, which presents the possibility that UVGI exposure could degrade the ability of a disposable respirator to protect the worker. To study this, we exposed both sides of material coupons and respirator straps from four models of N95 FFRs to UVGI doses from 120 to 950 J/cm2. We then tested the particle penetration, flow resistance and the bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps. We found that UVGI exposure led to a small increase in particle penetration (up to 1.25%) and had little effect on the flow resistance. UVGI exposure had a more pronounced effect on the strengths of the respirator materials. At the higher UVGI doses, the strength of the layers of respirator material was substantially reduced (in some cases, by >90%). The changes in the strengths of the respirator materials varied considerably among the different models of respirators. UVGI had less of an effect on the respirator straps; a dose of 2360 J/cm2 reduced the breaking strength of the straps by 20% to 51%. Our results suggest that UVGI could be used to effectively disinfect disposable respirators for reuse, but the maximum number of disinfection cycles will be limited by the respirator model and the UVGI dose required to inactivate the pathogen.
四小时
我也觉得应该是一次性的，万一口罩外面被病毒污染，肉眼又看不见，难道继续带？
这个太扯了，不管你从哪个网站看到的，一定是有上下文背景的，比如用于施工。
防肺炎反复用一周？我就问你摘下来的时候怎么保证可能带病毒的向外一面不污染内测？
N95里的过滤层不能加温不能水洗不能紫外灯照，家庭条件下没法处理复用的。倒是听过一个方法是买很多个，比如十几个轮流用，这样十几天之后再用第一个的时候病毒已经死光了。
Update：关于紫外线消毒有人提出质疑，我开始跟大家一样以为紫外线消毒是绝对可靠的，直到看到某口罩制造厂的专家解释（来源不记得了，有兴趣自己搜），紫外线照射可能会改变过滤层的分子结构，影响吸附性能。cdc也有文章关于紫外线照射对n95的功能性影响的分析。所以极端情况下紫外线照射重复使用肯定没问题，只是不要以为处理以后吸附性能还和原来的一样。
喷酒精行吗？
紫外灯也不行吗？是什么原因呢？
可以：
https://www.cdc.gov/niosh/nioshtic-2/20045956.html
The ability to disinfect and reuse disposable N95 filtering facepiece respirators (FFRs) may be needed during a pandemic of an infectious respiratory disease such as influenza. Ultraviolet germicidal irradiation (UVGI) is one possible method for respirator disinfection. However, UV radiation degrades polymers, which presents the possibility that UVGI exposure could degrade the ability of a disposable respirator to protect the worker. To study this, we exposed both sides of material coupons and respirator straps from four models of N95 FFRs to UVGI doses from 120 to 950 J/cm2. We then tested the particle penetration, flow resistance and the bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps. We found that UVGI exposure led to a small increase in particle penetration (up to 1.25%) and had little effect on the flow resistance. UVGI exposure had a more pronounced effect on the strengths of the respirator materials. At the higher UVGI doses, the strength of the layers of respirator material was substantially reduced (in some cases, by >90%). The changes in the strengths of the respirator materials varied considerably among the different models of respirators. UVGI had less of an effect on the respirator straps; a dose of 2360 J/cm2 reduced the breaking strength of the straps by 20% to 51%. Our results suggest that UVGI could be used to effectively disinfect disposable respirators for reuse, but the maximum number of disinfection cycles will be limited by the respirator model and the UVGI dose required to inactivate the pathogen.
这个方法好。如果口罩数量少，可以把带过的放太阳下晒晒。
其实这也是口罩稀缺情况下没办法的办法，事实上戴几个小时呼吸的水蒸气肯定极大了影响了过滤层的性能
4 个小时。
我也看到这个方法，等到口罩短缺的时候，可以一周七个轮流， 其它六个晒太阳。这样一周下来口罩上的病毒细菌都消灭干净了。只要口罩表面干净不破裂不变形可以多次使用。
嘲笑别人之前自己先放狗搜一搜，我是看过口罩制造厂家的专家说过紫外线照射会导致过滤层分子结构改变, 破坏过滤或者是吸附性能。我不懂只能信专家，你懂你来用专业知识辟谣看看？洗耳恭听
我就跟你杠上了，看清楚了，你列的这个东西是关于“减菌”，并没有说明对过滤性能的影响。
看到捕集效率几个字了没？既然选择要杠，起码认真阅读和理解内容吧。
ok，你说的对，我没看仔细上面贴的这段。暂时不知道这段摘要的来源，等我有空再查可信度。
顺带贴一些cdc的文章，链接在这里：https://www.cdc.gov/niosh/nioshtic-2/20045956.html
摘要：
The ability to disinfect and reuse disposable N95 filtering facepiece respirators (FFRs) may be needed during a pandemic of an infectious respiratory disease such as influenza. Ultraviolet germicidal irradiation (UVGI) is one possible method for respirator disinfection. However, UV radiation degrades polymers, which presents the possibility that UVGI exposure could degrade the ability of a disposable respirator to protect the worker. To study this, we exposed both sides of material coupons and respirator straps from four models of N95 FFRs to UVGI doses from 120 to 950 J/cm2. We then tested the particle penetration, flow resistance and the bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps. We found that UVGI exposure led to a small increase in particle penetration (up to 1.25%) and had little effect on the flow resistance. UVGI exposure had a more pronounced effect on the strengths of the respirator materials. At the higher UVGI doses, the strength of the layers of respirator material was substantially reduced (in some cases, by >90%). The changes in the strengths of the respirator materials varied considerably among the different models of respirators. UVGI had less of an effect on the respirator straps; a dose of 2360 J/cm2 reduced the breaking strength of the straps by 20% to 51%. Our results suggest that UVGI could be used to effectively disinfect disposable respirators for reuse, but the maximum number of disinfection cycles will be limited by the respirator model and the UVGI dose required to inactivate the pathogen.
找到出处了，我说用词咋这么奇怪呢，呵呵你愿意信就信吧，我不继续跟你杠了。链接：
出处：勞工安全衛生研究季刊 16:2 2008.06[民97.06] 頁197-203