Many people are looking for surgical virus protective face masks from different countries.We can see different letters on the packags of face masks from different countries.What do they mean?
Letters stand for different national standards.The N series of masks is the American standard, the KN series is the Chinese standard, the FFP series is the European standard, and the KF series is the Korean standard.The latter number refers to the protection ability, the higher the protection level is.95 refers to the ability to filter out more than 95% of the non-oily particles. The 90 series is not as high as the protection level of 95, but it can also resist more than 90% of the particles.In FFP series, 2 basically corresponds to 95,3 means that the filtration efficiency is higher, up to 99%.With a V at the end of the number to indicate a breathing valve.
If the filtering ability is sorted, it can be simply understood as:
FFP3 > FFP2=N95=KN95=KF94 > KN90.