Now the most commonly mentioned masks include KN95, N95, surgical masks, etc.
The first is the KN95 mask. According to the classification of national standard gb2626-2006 “self-absorption filter anti-particulate respirator of respiratory protective equipment”, masks are divided into KN and KP according to the efficiency level of filtration elements. Class KP is suitable for filtering oily particles, while class KN is suitable for filtering non-oily particles.
The filtration efficiency of KN95 mask should be greater than or equal to 95% in the case of sodium chloride particle detection, that is, the filtration efficiency of KN95 mask should be greater than or equal to 95% in the case of non-oily particles over 0.075 micron.
N95 masks are one of nine types of particulate respirators certified by NIOSH. “N” stands for not resistant to oil. “95″ means that the concentration of particles in the mask is more than 95% lower than the concentration of particles outside the mask when exposed to a specified number of specialized test particles.
Post time: Mar-31-2020