The filtration efficiency of N95 face mask on particles with aerodynamic diameter of 0.075 m±0.020 m is more than 95%.It can effectively filter and purify the abnormal odor inhaled (except toxic gas), and help reduce the exposure level of some inhalable microbial particles (such as mold, anthrax bacillus, tuberculosis bacillus, etc.), so as to effectively prevent influenza, tuberculosis and other microbial airborne diseases. Can also be used for respiratory protection of certain particles, such as polishing, cleaning and processing of dust from mineral, flour and some other materials, etc., it is also suitable for liquid or non-oily particles produced by spraying, which do not produce harmful volatile gases. Medical N95 is a medical respirator, not only to prevent particles, also need to prevent body fluids.