Why is the gauze mask not dustproof?

Why is the gauze mask not dustproof?


The "Labor Protective Equipment Equipment Standard (Trial)" issued by the State Economic and Trade Commission in 2000 clearly requires that "gauze masks should not be used as dust masks."


Gauze mask


  Why is this? Because the general cotton gauze mask can only block part of the dust, its dust blocking principle is mechanical filtering, that is, when the dust hits the gauze, it passes through layers of blocking to block some large particles of dust in the sand cloth. However, for some fine dust, especially dust smaller than 5 microns, it will pass through the mesh of gauze and enter the respiratory system, and dust below 5 microns can directly enter the alveoli, which has the greatest impact on human health. Wear a few more The layer also does not enhance the protective effect. Therefore, cotton gauze masks are not dustproof.