Why can’t masks be reused directly?

Why can’t our masks be reused directly? Everyone knows this common sense issue. Masks mainly block and absorb harmful substances through filter materials. Here, we mainly understand harmful substances as droplets or virus particles. A common answer on the market is that you need to replace the mask after wearing it for 4 hours. The reason for replacing the mask is that there are more harmful substances on the mask, and the mask's adsorption efficiency has decreased due to long-term use.

However, this is just everyone’s simple understanding. Professional experiments have shown that ordinary masks can be reused at least ten times, and their filtration efficiency will not be greatly reduced. There are even bolder experimental conclusions that ordinary masks can be reused 50 times to filter normally. The efficiency will not be significantly reduced. The filtration efficiency is not affected, but what about harmful substances?

The harmful substances we now mainly think of are viruses or droplets, and these can be removed through disinfection. Disinfection methods commonly used in ordinary households include: ultraviolet disinfection, heating and drying, steaming, alcohol spray disinfection, etc. Although these methods can kill viruses, they will damage the mask fibers and affect the filtration efficiency of the mask. For this new problem, we cannot kill it with one stick. From the experimental data, we can see that disinfection methods such as cooking and spraying alcohol will cause the filtering efficiency of the mask to decrease, but ultraviolet disinfection and heating and drying have little impact on the mask. More experimental data shows that the filtration efficiency of the mask is improved after such disinfection. The influence of experimental errors cannot be ruled out. However, we can know that ultraviolet disinfection and heating and drying will not have a great impact on the filtration efficiency of the mask.

Facing the epidemic is not only a matter for front-line workers. As rear-line personnel, we must also always pay attention to the epidemic trends. Staying at home is a huge contribution to the epidemic. However, we can not only stay at home and check our phones, watch TV, and play games, but we can also learn more about scientific knowledge and the epidemic, and use your scientific knowledge to try to study some issues that society needs, or move your fingers. , forward this article, and use your omnipotent circle to find engineers, researchers, relevant government departments or media people who will be attracted by this article.

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