How do surgical masks protect against dust?

Generally speaking, in order to make a mask to produce effective protection to the body, so the mask of the specifications of the has certain requirements, it must cover the nose and mouth, make the person can breathe free, in general, adult size surgical masks to 18 * 9, and the size of the surgical masks to 15 * 9 children.

Surgical masks are made of non-woven fabrics, which are made of a few fibers and are often made into two layers of masks, three layers and multi-layer activated carbon masks.

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Surgical masks can effectively prevent the fine dust in the air, especially for 2.5 micron, cut off dust efficiency is especially obvious, because the particle size of dust can directly into the alveoli, the effects on the human body health is the largest.

The use principle of surgical masks is that when the dust passes through the gauze, it will pass through layers of blocking, and the dust will be absorbed on the gauze, so that the fresh air can enter the respiratory system.