KN series are Chinese standards, FFP series are European standards

The following number refers to the protection capacity, the greater the protection level, the higher. The diameter of water molecules in the presence of gas is about 0.4nm, and the particle diameter of the coronavirus as a whole is about 60-400nm.

The mask cannot pass through larger particles, so it can block the virus. 95 refers to the efficiency of filtering such particulate matter up to 95%. The 90 series does not have the protection level of the 95, but it can resist more than 90% of the particles.

In the FFP series, 2 basically corresponds to 95, and 3 has a higher filtration efficiency, reaching 99%.

It is easier to understand the filtering ability with the following set of relationships: FFP3>FFP2=N95=KN95=KF94>KN90. In addition, a V at the end of the number indicates that there is a breathing valve.

Use of FFP2 masks
1. Individual protection products designed to prevent or reduce dust in the air from entering the human respiratory organs to protect life safety;

2. Material: Most anti-particulate masks are constructed with two layers of non-woven fabric inside and outside, with a filter cloth (melt blown cloth) in the middle layer;

3. Filtering principle: Filtering fine dust mainly depends on the filter cloth in the middle. Because the melt blown cloth has the characteristic of static electricity, it can absorb small particles. Because the fine dust is adsorbed on the original filter, and the original filter cannot be washed with static electricity, the self-priming filter anti-particulate respirator needs to replace the original filter regularly

4. Remarks: The international requirements for the use of anti-particulate masks are quite strict. The anti-particulate masks belong to the first level of personal protective equipment, which is higher than earmuffs and protective glasses. The more authoritative testing certifications include CE certification in Europe and NIOSH certification in the United States, while China’s standards are similar to NIOSH in the United States

5. Protection object: The protection object is divided into KP and KN. The so-called KP is able to protect oily and non-oily particles, while KN is only able to protect non-oily particles.

6. Protection level: China's protection level is divided into KP100, KP95, KP90 and KN100, KN95, KN90. Among them, KP100 and KN100 have the highest national standard requirements for filtration efficiency greater than 99.97%, so the safety of use is also the highest.