Nonwoven masks: one for the surface made of cotton skimmed gauze or knitted fabrics, the middle of a variety of nonwoven fabrics; another directly from the nonwoven sewing. Filtering effect is good, breathable a little worse, the latest varieties for the surface and the back of the non-woven material, the middle of the filter paper, so that the non-woven mask filtration effect of a higher level.
The gauze mask is made of sparse cotton cloth after sewing and is mainly used in the operating environment containing low concentrations of harmful gases and vapors. The cartridge contains only the adsorbent or absorbent.