I want to talk about the difference between medical protective masks, N95 masks and KN95 masks. 1. Medical protective masks: comply with China's GB 19083-2010 mandatory standards, with a filtration efficiency of ≥95% (using non-oily particles for testing). It is required to pass the synthetic blood penetration test (to prevent body fluid from splashing) and meet the microbiological indicators. 2. N95 mask: American NIOSH certification, non-oily particulate matter filtration efficiency ≥95%. 3. KN95 mask: in line 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! So the filtration efficiency levels are the same. So, 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, KN90 is actually enough. Only when medical staff have body fluid splashes, it needs to be very strict when the environmental concentration is high. But it should be noted that some celebrities have the same style of masks, but they do not care about the protective effect. The above-mentioned 3M technicians told a reporter from 21st Century Business Herald. Regarding the frequency of replacement masks, the above-mentioned technicians said that if they are dirty, they can be replaced, ranging from three to five days, or if the medical staff goes to the contaminated area, they can be replaced. In fact, regarding the frequency of replacement, currently, foreign countries, including WHO, have no clear conclusions on the best wearing time of N95 masks, and my country has not yet made relevant regulations on the use time of masks. Some researchers have done related studies on the protection efficiency and wearing time of N95 medical protective masks. The results show that the filtration efficiency of N95 masks 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 wearing for 3 days. %. However, the mask should be replaced in time when the following situations occur: 1. When the respiratory impedance increases significantly; 2. The mask is damaged or damaged; 3. When the mask cannot be closely attached to the face; 4. The mask is contaminated (such as blood stains or stains). 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 the copper mask
contains activated carbon, the mask has a peculiar smell. In addition, there are a few 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, which should be close to the nose and mouth, and the dark-colored side facing out; the 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, so that the virus will soak through the mask with droplets, there is still a chance of infection. 4. Be sure to make the mask fit well with the face as much as possible. The simple test method is: After putting on the mask, exhale forcefully so that the air cannot leak from the edge of the mask. The last point, posture is very important, otherwise it will be white if you wear it!
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