The N95 face mask is actually a respirator. The KN95 re […]
The N95 face mask is actually a respirator. The KN95 respirator is a respiratory protective device. Compared with ordinary masks, the design of the respirator fits the face more closely. It can filter particulates in the air very effectively. Among them, N means Not resistant to oil, which can be used to protect non-oily suspended particles; 95 means that the filtration efficiency is greater than or equal to 95%, indicating that after careful testing, this respirator can block at least 95% of very small (0.3 Micron level) test particles.
In terms of design, if ranked according to the priority of the wearer's own protection ability (from high to low): N95 mask> surgical mask> general medical mask> general cotton mask.
If worn correctly, the filtering capacity of N95 is better than ordinary masks and medical masks. However, even if it is fully compliant with the requirements, it cannot completely eliminate the risk of infection or death.
KN95 is one of the levels specified in the Chinese standard GB2626-2006
N95 is one of the levels specified in American Standard 42 CFR 84.
The technical requirements and test methods of these two levels are basically the same,
Under the corresponding standards, the filtration efficiency reaches 95%.
How long can KN95 masks be used?
At present, there is no clear conclusion on the optimal wearing time of N95 masks abroad, including WHO, and China has not yet made relevant regulations on the use time of masks.
Some researchers have conducted relevant research on the protection efficiency and wearing time of N95 medical protective masks. The results show that the filtration efficiency of N95 masks is still above 95% for 2 days, and the respiratory resistance does not change much; the filtration efficiency is reduced to 94.7 after 3 days of wearing %.