Original title: surgical mask, N95, KN95.. Silly can't tell? You will understand after reading this article. These days, people all over the country are paying attention to masks- "medical masks", "medical nursing masks", "surgical mask", "medical protective masks", as well as "N95" and "KN95" and even "FFP2". Aren't you dazzled? It looks like a mess, so many different names, different types of masks, will you really choose? Today, Xiaobian will talk about it for you. Note: surgical mask, medical protective mask, N95 and FFP2 can be used in medical institutions for protection. KN95 cannot be used in medical institutions, but ordinary people can choose by themselves. Other masks are up to you. Medical mask, medical nursing mask Medical masks and medical nursing masks YY 0969 are mostly designed and manufactured by enterprises themselves. Generally, they can not guarantee the filtration of pathogenic microorganisms and dust. They are generally used for routine nursing in hospitals. Their main function is to block the daily cross-contamination between medical staff and patients, and there is no particularly high requirement. If it is used by the public, that is to say,KN95 Face Mask, it is used to block bad breath and pretend, the actual effect of protection is not very ideal. Medical surgical mask: YY 0469-2011 Expand the full text YY0469 requires the surgical respirator to have a bacterial filtering performance. Generally, the filtration efficiency for non-oily particles should be more than 30%, and the filtration efficiency for bacteria should be more than 95% (note that this is not the meaning of N95, and it should not be confused with the medical respirator). Surgical mask also has the requirement of synthetic blood penetration (which can be simply understood as impermeability). When making masks, enterprises usually divide them into three layers: the internal absorbent layer, the middle filter layer,KN95 Mask with Fast Shipping, and the external waterproof layer. Each layer has a special role (here is the key point, which will be used later). Because of the different workplaces, the particulate matter that people are exposed to can generally be divided into two categories: oily and non-oily, of which the "KN" mask is mainly used to protect non-oily particulate matter, while the "KP" mask can protect both oily and non-oily particulate matter, such as the chemical industry is exposed to more oily particulate matter (such as paraffin). KP-type masks are generally used; KN-type masks are mainly used in other industries, including ordinary civil use (of course, some civil haze masks can use KP-type masks). According to the requirements of GB2626 standard, KN type masks are divided again according to their filtering performance on non-oily particles, so we are familiar with KN90, KN95 and KN100 masks. Among them, KN95 mask is one of the most common masks, which has a filtering performance of more than 95% for non-oily particles (detected by sodium chloride). See the following table for details. See here, I don't know if you have found a problem, KN95 Face Mask ,KN95 Mask for Epidemic Prevention and Control, just before, I have told you that the medical surgical mask (YY0469-2011) requires that the filtering performance of non-oily particles is ≥ 30%, which is much lower than the requirement of ≥ 95% of KN95 mask, so many people naturally think that: Especially the KN95 mask is definitely better than the medical surgical mask! Is this absolute? Surgical masks have anti-penetration requirements, generally divided into three layers, the outermost layer is the waterproof layer, the main reason for using masks in the medical environment is to isolate bacteria, and once bacteria adhere to the outer surface of the mask, it is very easy to follow the wet mask directly into the mask, so anti-penetration is very important! Throughout GB2626, there is no standard requirement for KN-type masks to be waterproof, not only KN-type masks, but also KP-type masks, that is to say, qualified masks that meet all GB2626 standards do not have anti-penetration requirements.
At this point, KN-type masks are not as good as surgical masks! Is it good or bad to have a breathing valve? Because doctors and patients wearing masks can not guarantee that they are healthy and virus-free (infectious during the incubation period), and the airflow of masks with exhalation valves is only one-way protection, which can not cut off the transmission route very well. From the perspective of epidemic control, two-way protection is the most correct way, so this kind of masks is not recommended. There is no "N95" in GB19083, but "Grade 1", "Grade 2" and "Grade 3" are used to express the filtration efficiency grade. Generally, Grade 1 can meet the requirements of "N95/KN95". That is to say, as long as any "medical protective mask" meets the GB19083 standard, it has absolutely reached the filtration efficiency of N95 and KN95. In addition, like the surgical mask of YY0469-2011, GB19083 also puts forward the requirement of "synthetic blood penetration", and also adds a parameter requirement of "surface moisture resistance", which clarifies the protective effect of medical protective masks on blood and body fluids, which is not found in GB2626 (KN type). If you feel a little dizzy about the above academic content, let's use another picture to compare the differences between the most common masks: 1. The KN type mask conforming to GB2626 can not be used for medical operations, especially for high-risk operations such as tracheotomy and tracheal intubation, which may splash, because it can not guarantee that the mask will not be wet. 2. Masks above Grade 1 conforming to GB19083 can not only achieve 95% filtration, but also prevent liquid penetration, and can be used for various operations in medical institutions. 3. It conforms to the surgical mask of YY0469, with less than 95% filterability, but it can prevent liquid penetration. Because its tightness with the face is not as good as that of medical protective masks, it is generally not used for the protection of high-risk operations, but it can meet the operation of ordinary risks. The above are all choices for medical institutions, so how should the public choose? 1. If you can choose a surgical mask, try to choose a surgical mask. (Comfort considerations) 2. If you can choose a mask without a breathing valve, try to choose a mask without a breathing valve. (For the safety of others) If you really don't have a mask,Against Bacteria Breathable KN95 Face Mask, stay at home and don't go anywhere! Editor: Wang Xing Responsible Editor: Fan Liping Source: Zhongshan Hospital, SIFIC Infection Official Micro, Wenhui Client Return to Sohu to see more Responsible Editor:. zjyuan-group.com