What is the difference between N95, KN95, medical N95?

What is the difference between N95, KN95, medical protective mask, and medical N95?
In general, N95 / KN95 refers to masks (respirators) with non-oily particle filtration efficiency ≥95. Medical protective masks / medical N95 consider the special requirements of the medical environment. On the basis of non-oily particle filtration efficiency ≥95, liquid barrier, And other requirements.
● N95: In line with American NIOSH (National Institute of Occupational Safety and Health) "42CFR Part 84 Respiratory Protective Devices"; non-oily particle filtration efficiency ≥95.

● KN95: in line with China's standard "GB2626-2006 Respiratory protective equipment-self-priming filter type anti-particulate respirator"; non-oily particle filtration efficiency ≥95.
The specific technical requirements and test methods for the filtration efficiency of non-oily particles in the N95 and KN95 standards are basically the same, and the protective effects are basically the same, but they belong to the standards of different countries. That is N95≈KN95.
● Medical protective masks: comply with the national standard "GB19083-2010 medical protective masks"; according to the non-oily particle filtration efficiency ≥95, ≥99%, ≥99.97% correspond to "level 1" "level 2" and "level 3"; Liquid barriers are required. They have the effect of blocking blood, body fluids, and splashes, and exhalation valves are not allowed.
● Medical N95: Refers to a mask that reaches N95 level and meets medical standards; measured by American standards, it should be certified by NIOSH of the United States, and certified by the US Food and Drug Administration (FDA); measured by Chinese standards, it should meet GB19083-2010 medical protective mask.
There is no "N95" in the "GB19083-2010 Medical Protective Mask" in China, but as long as it meets the GB19083-2010 standard, it has definitely reached the N95 filtration efficiency. The certification is often referred to as "Medical N95".
That is a medical protective mask ≈ medical N95.
Common medical protective masks (medical N95) masks:
Domestic 3M mask 9132 model: Obtained N95 level certification from NIOSH in the United States, and also obtained certification from China Food and Drug Administration, which complies with Chinese standard "GB19083-2010 Medical Protective Mask".
Imported 3M mask 1860 model: obtained N95 level certification of the United States NIOSH and the United States FDA certification, and also obtained the China Food and Drug Administration certification, in line with the Chinese standard "GB19083-2010 medical protective mask."
The US NIOSH is not a medical device standard. Some of the N95 masks are medical because they are certified by the US Food and Drug Administration (FDA) or comply with the Chinese standard "GB19083-2010 Medical Protective Masks." Therefore, the statement that N95 and KN95 "one is a medical device standard and one is a common standard" is incorrect.
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