What's the difference between kn95 mask and n95 mask?

There is no obvious difference between N95 mask and KN95 mask, but there are some differences in manufacturing and testing.

N95 mask and KN95 mask have the same protection level, but they pursue different testing standards. N95 masks follow the testing standards of the United States, and KN95 masks follow the testing standards of China. Both of them have good protection efficiency for non-oily particles, such as sodium chloride particles used in experiments. Protection efficiency >; 95%。