Both of these standards require masks to be tested for filtering effects when capturing salt particles (NaCl), and both are tested at a rate of 85 liters per minute. However, there are some differences between N95 and KN95 masks, so I will emphasize them here. The key differences:

1. If the manufacturer wants to get the KN95 standard, it needs to perform a mask sealing test on a real person, and the leakage rate (the percentage of particles leaking from the side of the mask) needs to be ≤ 8%. N95 standard masks do not require a sealing test. (Remember: This is the country's requirements for commodities. Many industrial companies and hospitals will require their employees to do a seal test.)

2. N95 masks require relatively high pressure drop during inhalation. This means they need to be more breathable.

3. N95 masks also have slightly strict requirements on the pressure drop during exhalation, which should help improve the breathability of the mask.

Although only KN95 masks need to pass the sealing test, both N95 masks and KN95 masks can filter 95% of particles. In addition, N95 masks have strict requirements for air permeability.

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