Dust blocking efficiency
　　The efficiency of dust masks is the level of its fine dust, especially for 2.5 microns below the respiratory dust barrier efficiency as the standard. Because the size of the dust can be directly into the alveoli, the greatest impact on human health. Gauze masks, the dust-proof principle is the mechanical filter, that is, when the dust hit the gauze, after - m layer of the barrier, some large particles of dust in the sand cloth. For some fine dust, especially less than 2.5 microns of dust, it will be from the mesh into the gauze to go into the respiratory system. Dust masks, the filter activated carbon fiber felt or non-woven fabric composition, those less than 2.5 microns of respirable dust in the process through the filter.
Degree of adhesion
　　Anti-side-masks designed to prevent the air through the mask and the human face through the gap without being sucked into the consideration of technical requirements. Air is like water, where the resistance is small where the first flow. When the mask shape and the face is not close, the same dangerous substances in the air will never leak into the Department, into the human respiratory tract. So, even if you use the filter no matter how good the mask. Also can not guarantee your health. Many foreign regulations and standards, workers should regularly mask the adhesion test. The purpose is to ensure that workers use the appropriate number of masks and wear masks in the right steps.
Wear comfortable
　　So that workers will be happy to insist on wearing in the workplace and improve their work efficiency. Maintenance-free masks abroad, do not have to clean or replace parts, when the dust saturation or mask damaged after discarded, so that not only ensure the masks of the health and remove the time and effort to maintain the mask workers. And many masks are used arch shape, both to ensure a good fit with the shape into the face and can retain some space in the nose and mouth, wearing comfortable.
Discomfort crowd
　　People with difficulty in the heart or respiratory system (such as asthma emphysema), pregnancy, dizziness after wearing, difficulty breathing and skin sensitivity.