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What is the difference between KN95 mask, N95 mask, medical mask, medical surgical mask FFP2 and other masks

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Wuhan pneumonia epidemic broke out, everyone put on masks! In addition to the difficulty of buying masks, there is also the problem of the difficulty of buying masks. Nowadays, there are so many kinds of masks. In all kinds of masks, how do we distinguish and choose? It is mainly classified into two categories: one is medical masks and the other is civilian masks. Medical surgical masks, medical protective masks, N95, FFP2 can be used for the protection of medical institutions, KN95 can not be used in medical institutions, but ordinary people can choose their own, what is the difference between other masks, first look at this table. 2. Medical: Medical surgical mask: YY0469-2011 Medical surgical masks must be produced according to the medical standard YY0469-2011. If the enterprise standard set by the company meets or exceeds the requirements of YY0469, it can also be printed on the outer packaging of the mask (thus, it is not necessary to have YY0469 to be qualified, specific