Medical masks are basically limited to use or disposable, can not be reused after washing. At present, the high proportion of medical protective masks on the market should be 3m1860n95 protective masks, which are used in epidemic situations such as avian influenza, Ebola and Middle East respiratory syndrome. It can be used for 8 hours generally. However, once there is blood or saliva splashes on the medical protective masks, they must be replaced immediately. The use of medical surgical mask is developed on the basis of the application of the mask invented by Paul Berger. It is not only used to protect patients in surgery, but also increases some protective effects on medical staff. According to yy0469-2004 standard, the size of the mask and the filtration efficiency (bacterial filtration efficiency) of the mask on large particles of bacteria were specified to reflect the blocking effect of the mask on the droplets produced by the wearer of the mask. The synthetic blood splash test with certain pressure was used to evaluate the effect of the mask on the infection caused by the instantaneous penetration of body fluid. Some are similar to particulate respirators. The standard of surgical mask at home and abroad has no requirement on the tightness between the mask and the wearer's face, because the surgical mask is not used to prevent airborne diseases and does not provide respiratory protection to the wearer, which is the main difference between the surgical mask and the medical protective mask. Medical protective mask has the protective performance of surgical mask and particulate matter protective mask. It is used in hospital, which can filter particles in the air and block droplets, blood, body fluids and secretions. It is also a class II medical device product and must comply with the mandatory standard gb19083-2010. The earlier version of gb19083 was formulated urgently during the outbreak of SARS in 2003, and the old version was revised in 2010. Gb19083 has clear requirements on the filtration efficiency and tightness of masks, which is similar to gb2626-2006. Medical protective masks are also surgical masks, so it is not allowed to set up a breath valve to prevent the droplets generated by the wearer from polluting the surgical wound through the expiratory valve. The blue-green appearance of many medical protective masks is just a habit of the medical industry, The material on the outer surface of the mask can block the body fluid from splashing. In this regard, non-medical particulate matter protective masks are usually not considered.