a single-use medical product that covers the mouth and nose of the wearer and serves a barrier for direct transmission of infectious particles from the mask wearer to other people around. A modern mask commonly consists of a filter layer (MELT BLOWN), which is settled between the two outer layers of non-woven material (spunbond), plus a flexible aluminum insert that maintains a snug fit mask in the shape of a nose . The mask is fixed upon the face with elastic ear loops.
In compliance with GB2626 standard requirements, KN type face masks are classified according to their filtering efficiency for non-oily particles. The KN95 face mask refers to a filtration efficiency of over 95% for non-oily particles with size larger than 0.075 microns, but the diameter of the new coronavirus pneumonia virus is about from 0.1 to 0.12 microns. This means wearing a KN95 face mask can effectively prevent the virus penetration.
Respiratory mask N95 A respiratory face mask perhaps is the easiest way to limit the negative effects of smog on a human-being. Respirators consist of three layers: the external layer protects against biological fluids, the medium one serves as a filter that isolates respiratory organs from 95% harmful particles diametered up to 0.3 microns, and the internal layer protects from dampness. Respiratory masks of N95 type also effectively protect against particles with a diameter of 2.5 microns and even less. These respiratory masks have FFP2 protection level.