The core material of the mask is a PTFE Nano film, and the diameter of the film fiber is between 100 and 200 nanometers. The PTFE has the following three characteristics: Higher blocking efficiency. The main reason is that the fiber diameter of the material used is smaller than that of traditional materials (the fiber diameter of non-woven materials used in traditional masks is more than 1000 nanometers), which can more effectively block PM2.5 in the air (aerodynamic equivalent diameter is 2500 nanometers or less Particulate matter), and effectively reduce the concentration of bacteria and viruses in the air;