Civil masks are planar, this is better than disposable surgical masks protective again low a level of masks, structure with disposable surgical masks, just use among melt-blown fabric is not treated in a very ordinary melt-blown fabric, the only barrier effect of droplets, if fiber is fine, also has a short period of time for bacterial barrier effect, but there is no charge between adsorption force, breathe in, bacteria can with differential pressure in the body, the protective effect of general!