KN95 is a Chinese standard mask, derived from the Chinese national standard GB 2626-2006 "Respiratory protective equipment self-priming filter anti-particulate respirator", this standard is a mandatory national standard in China, proposed by the State Administration of Work Safety The personal protective equipment standardization technical committee (SAC / TC 112) is under the jurisdiction. KN95 mask is a kind of mask with filtering efficiency of particulate matter in our country. KN95 masks and N95 masks are actually the same in terms of particle filtration efficiency.

Key words : face mask，kn95 mask, kn95face mask,n95mask, n95 masks , kn 95masks , kn95 face masks , face masks