KF94 mask is not a medical mask. KF94 mask is a dust mask produced in Korea, 3 layers of the mask are gauze, only 1 layer is electrostatic adsorption layer, only in line with daily health care use. The filtering effect of the mask is better than that of the KF94 mask. KF94 mask does not belong to disposable mask, the use of time limit up to 48 hours, but the band is loose, wear the ear pressure is less, more comfortable but feel not pulled tight, will lead to edge leakage, for the prevention of droplet-borne diseases general effect.