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n95 mask

The N95 mask is one of the nine particulate protective masks certified by NIOSH."N"means not resistant to oil."95"means that when exposed to a specified number of special test particles,the particle concentration inside the mask is more than 95%lower than the particle concentration outside the mask.Among them,the value of 95%is not the average value,but the minimum value.N95 is not a specific product name.As long as the product meets the N95 standard and passes the NIOSH review,it can be called"N95 mask".The protection level of N95 means that under the testing conditions specified in the NIOSH standard,the filtering efficiency of the mask filter material to non-oily particles(such as dust,acid mist,paint mist,microorganisms,etc.)reaches 95%.
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　　Introduction to N95 mask

　　The N95 mask is one of the nine particulate protective masks certified by NIOSH."N"means not resistant to oil."95"means that when exposed to a specified number of special test particles,the particle concentration inside the mask is more than 95%lower than the particle concentration outside the mask.Among them,the value of 95%is not the average value,but the minimum value.N95 is not a specific product name.As long as the product meets the N95 standard and passes the NIOSH review,it can be called"N95 mask".The protection level of N95 means that under the testing conditions specified in the NIOSH standard,the filtering efficiency of the mask filter material to non-oily particles(such as dust,acid mist,paint mist,microorganisms,etc.)reaches 95%.

　　R&D history

　　In 1992,during his teaching at the University of Tennessee in the United States,Cai Bingyi,a Chinese-American scientist,led a team to develop a positively and negatively charged material that could absorb 95%of dust,bacteria,and viruses and other fine particles before passing through a mask.Produce polarization.[1-2]This key material was soon used to make disposable N95 masks for personal use.In 1996,the U.S.Centers for Disease Control discovered that N95 masks can also absorb and block viruses.[1-2]In 1995,the technology developed by Cai Bingyi received a US patent.[7]

　　Function and purpose

　　The N95 mask has a filtration efficiency of more than 95%for particles with an aerodynamic diameter of 0.3µm.The aerodynamic diameter of air bacteria and fungal spores mainly varies between 0.7-10µm,which is also within the protection range of N95 masks.Therefore,the N95 mask can be used for respiratory protection of certain particulate matter,such as dust generated during grinding,cleaning and processing of minerals,flour and certain other materials,and it is also suitable for liquid or non-oily non-oil produced by spraying.Particulate matter of harmful volatile gas.It can effectively filter and purify the inhaled abnormal odors(except toxic gases),help reduce the exposure level of certain inhalable microbial particles(such as mold,anthracis,tuberculosis,etc.),but cannot eliminate contact infection,illness or death The risk[3].

　　The U.S.Department of Labor once recommended that medical staff use N95 masks to prevent microbial airborne diseases such as influenza and tuberculosis.

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