N95, KN95, FFP2, KF94, the difference between these masks
These refer to mask levels. The N series of masks are American standards, the KN series is Chinese standards, the FFP series is European standards, and the KF series is Korean standards.
The latter number refers to the protection ability, the greater the protection level is, the higher the protection level is. When water molecules exist as a gas, the diameter is about 0.4nm, and the overall particle diameter of the coronavirus is about 60-400nm. Masks cannot pass through larger particles, so they can block viruses. 95 means that the efficiency of filtering such particles is 95%. The 90 series does not have the high degree of protection of 95, but can also resist more than 90% of particulate matter. In the FFP series, 2 basically corresponds to 95, and 3 has a higher filtering 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 a breathing valve.
To fight viruses and flu, the N95 series is enough. Medical N95 masks need to be protected against high-pressure liquid splashing, so they have a higher standard than ordinary N95.
The mask model and execution standards are printed on the left side of the mask. Those that have the following implementation standards are qualified masks, which can be purchased according to this.
N95 is produced according to the American standard NOISH;
FFP2 is the European standard EN149;
· KN95 is a Chinese standard, the standard for ordinary KN95 masks is GB2626-2006, and the standard for medical KN95 masks is GB19083-2010.
In addition, the common standard for medical surgical masks is YY0469-2010 or YY0469-2011, which is printed on the individual outer packaging of each mask.