Principles for selecting medical masks 1. The dust blocking efficiency of masks. The dust blocking efficiency of a mask is based on its blocking efficiency against fine dust, especially respiratory dust below 5 microns. In general gauze masks, the principle of dust blocking 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 not be able to function as a barrier. At present, there are some dust masks abroad, whose filter material is composed of fibers charged with permanent static electricity. Respiratory dust smaller than 5 microns is attracted by static electricity and adsorbed on the filter material when passing through this filter material. Play a role in blocking dust.
Medical mask selection principle two, the degree of closeness of the mask to the shape of the face. When the shape of the mask is not close to the human face, dangerous substances in the air will leak from the close to the human's respiratory tract. Then, even if you choose a mask with the best filter material, it will not protect your health. Many foreign regulations and standards now stipulate that workers should regularly perform mask tightness tests. The purpose is to ensure that workers choose appropriate masks and master the correct method of wearing anti-smoke masks.
Principles for selecting medical masks III. Comfortable wearing of masks. Its requirements include low respiratory resistance, light weight, hygienic wearing, and easy maintenance. Only then will workers be willing to wear it in the workplace. Now there are maintenance-free masks, which do not need to be cleaned or replaced, and can be discarded when the dust blocking is saturated or the mask is damaged, which not only guarantees the hygiene of the mask, but also saves the time and effort of the workers to maintain the mask. In addition, many masks use arched design, which can not only ensure a good fit with the shape of the human face, but also retain a certain amount of space at the mouth and nose, which is comfortable to wear.
