1. Protective mask: Comply with China GB 19083-2010 mandatory standard, filtration efficiency ≥95% (using non-oily particulate matter test). It is required to pass the synthetic blood penetration test (to prevent body fluid from splashing), and it is required to meet the microbiological indicators.
2. N95 mask: NIOSH certification, non-oily particulate matter filtration efficiency ≥95%.
3. KN95 mask: Comply with China’s GB 2626 mandatory standard, non-oily particulate matter filtration efficiency ≥95%.
The test methods for the filtration efficiency of the above three levels of masks are exactly the same! Therefore, the filtration efficiency level is the same.
Therefore, everyone buys the same masks for NIOSH N95 and GB2626-2006 KN95. The key to wearing a mask is the close contact with the face, that is, no air leakage! Please read the instructions carefully before wearing it.
“The core standards for industrial masks and consumer masks are the same. According to the GB2626 standard KN95 is sufficient. KN90 is actually sufficient. Only when staff have body fluid splashes and high environmental concentrations, it needs to be very strict. But be careful, some The same masks of stars are beautiful, but regardless of the protective effect.”
Regarding the frequency of replacement of masks, technicians said that if they are dirty, they will be replaced, ranging from three to five days, or if they go to contaminated areas, they will be replaced.
In fact, regarding the frequency of replacement, at present, foreign countries, including WHO, have not made clear conclusions on the best wearing time of N95 masks, and there is no relevant regulation on the use time of masks. Some researchers have done relevant research on the protection efficiency and wearing time of N95 respirators. The results show that the filtration efficiency of N95 respirators remains above 95% when worn for 2 days, and the respiratory resistance does not change much; the filtration efficiency is reduced to 94.7% after 3 days. .
But when the following situations occur, the mask should be replaced in time:
1. When the respiratory impedance increases significantly;
2. When the mask is broken or damaged;
3. When the mask and face cannot be closely attached;
4. The mask is contaminated (such as blood stains or droplets and other foreign objects);
5. It has been used in individual wards or in contact with patients (because the mask has been contaminated);
6. If it is a mask containing activated carbon, there is a peculiar smell in the mask.
In addition, there are several points to pay attention to when wearing a mask:
1. Wash your hands before wearing a mask, or avoid touching the inner side of the mask while wearing a mask to reduce the possibility of contamination of the mask.
2. Distinguish the inside, outside, top and bottom of the mask. The light-colored side is the inside. It should be close to the nose and mouth, with the dark side facing out; one end of the metal strip is above the mask.
3. Never use your hands to squeeze masks, including N95 masks, which can only isolate the virus on the surface of the mask. If you squeeze the mask with your hands and make the virus soak through the mask with droplets, you may still be infected.
4. Make sure that the mask is in good contact with the face. The simple test method is: After putting on the mask, exhale forcefully so that air cannot leak from the edge of the mask.
The last point is that posture is very important, otherwise it will be worn for nothing!