What is the difference between KN95 and N95 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 respirator certified by my country’s GB2626-2006 self-priming filter 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 Chinese standard, and 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).