Standard definition:
Contrast: the standards are different. The data of the United States comes from the National Institute of Occupational Safety and Health (NIOSH), and the data of South Korea comes from the US Food and Drug Administration (MFDS).
N95: American standard, which means that the filtration rate of the mask for non-oily particles with a diameter of 0.3μm is more than 95%. China is KN95, and the reference standard is the same.
KF94: Korean standard, which means that the filtration rate of the mask to particles with an average diameter of 0.4μm is greater than 94%.
KF94: It can filter out at least 94% particles with a diameter of 0.4μm, and both oily and non-oily particles can reach the same level. Splash resistance and bacterial filtration ability are not required. N95: It can filter out at least 95% of particles with a diameter of 0.075 micron. ..
Only non-oily particles. Splash resistance and bacterial filtration ability are not required. The same is N95 and KN95, which are civil and medical. There is a big difference between the two. The hospital accepts donations of medical N95, but does not accept civil N95. Ordinary people are hard to buy and don't need it.
So it won't be expanded here. The advantage of N95 is good fit and air tightness, but civil N95 pays more attention to protecting pollen and smog particles, and has no rigid requirements for the spread of virus droplets. No matter civil N95 or KF94, they are not so professional. N95 .
KN95 and KF94 don't mean much to ordinary people. The medical protective mask N95 can be used for two days without pollution, and the medical surgical mask should be replaced every four hours and used once.