In the post-epidemic era, masks have become essential protective equipment for each of us. In addition to ordinary masks and medical masks, KN95 masks and N95 masks are also concerned by many people. So, what is the difference between N95 and KN95 masks?
N95 is the certification level of American respirators, certified by the National Institute of Occupational Safety and Health (NIOSH). This type of mask can filter out more than 95% of non-oily particles (aerosol) under the specified air flow (85L/min), so it is named N95. And if it can filter more than 99% of the particulate matter (aerosol), it is called an N99 mask. In addition, corresponding to N95, KN95 is a kind of mask certified by China's GB2626-2006 self-priming filter type anti-particulate respirator standard for respiratory protection products.
The protection levels of KN95 and N95 masks are equivalent, but they follow the testing standards of different countries. The KN95 mask follows the China’s standard, while the N95 mask follows the American standard. Both of them have a protection efficiency of not less than 95% for non-oily particles (sodium chloride particles for experimental use).
Both KN95 masks and N95 masks include medical and non-medical types. Among them, KN95/N95 masks with the "medical" mark can be used for front-line protection of medical staff during the anti-epidemic period. Masks without the "medical" mark are not recommended for medical staff, but ordinary people can use it. The masks complying with GB19083 level 1 and above can not only achieve 95% filterability but also prevent liquid penetration, which can be used for various operations in medical institutions.
Viruses usually do not exist alone in the air, but are attached to particles such as droplets, dust, dander, etc. The filtration mechanism of KN95 and N95 masks is to block these fine particles through the high-performance filter layer in the mask, and build a protective barrier. Therefore, when wearing KN95/N95 masks, that is, self-priming filter type anti-particulate respirator masks as respiratory protective equipment, pay attention to the tightness, and be close to the face, and never leave a "convenience door" for viruses and bacteria.
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