N95 mask can be reused, but the number of repeated uses is related to different occasions and different crowd densities. If you just stay at home or go to an empty place, you can generally reuse it for about 4-5 times.

N95 Respirator

N95 mask is one of nine kinds of anti-particle masks certified by NIOSH (National Institute of Occupational Safety and Health).

"N" means particles that are not suitable for oiliness (cooking fumes are oily particles, but droplets produced by people talking or coughing are not oily); "95" means that the filtration efficiency reaches 95% under the detection conditions specified by NIOSH standard.

N95 is not a specific product name. As long as it meets the N95 standard and passes the NIOSH review, the product can be called "N95 mask" and can be used with an aerodynamic diameter of 0.075? m 0.020？ The filtration efficiency of M particles is above 95%.

R&D history

During the period of 1992, when Cai, a Chinese-American scientist, taught at the University of Tennessee, the leading team developed a material with positive and negative charges, which can absorb 95% of dust, bacteria and viruses and polarize them before passing through the mask.

This key material was soon used to make disposable N95 masks for personal use. 1996, the US Centers for Disease Control found that N95 masks can also adsorb and block viruses. From 65438 to 0995, the technology developed by Cai was patented in the United States.