KN95 mask is the name of China's national standard. KN stands for filtering non-oily particulate matter, and 95 stands for 95% filtration efficiency of 0.3 micron particulate matter. Therefore, according to the national standard, it is the same as the American standard n95 mask. As long as it is a respiratory protective mask that passes 95% filtration efficiency and other indicators according to GB2626-2019, it can become a kn95 mask.
The kn95 mask can be reused, provided that the mask is scarce, and the mask is not damaged and the surface of the mask is not contaminated. For example, the user only takes one or two hours, and the inside of the mask is not contaminated. There is no contact with an infected person or a suspected infected person. The mask can be used for two or three days, but it can not be used continuously for more than ten days. When removing the mask, be careful not to touch the inside of the mask, which will lose the protective effect and wear a mask Wash your hands before, and even after removing your mask. If the user feels that there is resistance to breathing after wearing the mask, and the mask and the face cannot be in close contact, it is necessary to replace the mask with a new one in time.