The key to the choice of masks is the grade and adapt to the size of their head. Scientific selection of dust masks can help prevent the occurrence of pneumoconiosis.
Now the mask must implement GB2626-2006 standard. The grade of dust masks is divided into three grades: KN100, KN95 and KN90. Among them, KN100 can achieve nearly 100% (more than 99.97%) protection against ultra-fine dust.
The protective effect of dust masks depends on 2 aspects. One is the filtration efficiency of the filter cotton. The second is the degree of tightness of the mask combined with the face.
So the mask must be divided into sizes, not divided into sizes of the mask and the face of the fit effect varies from person to person.
The way to clear the dust: scientific selection of dust masks certified to the GB2626-2006 standard can help prevent lung injuries from occurring.
1, choose the compound half mask type. Disposable masks are not suitable for long-term protection due to high air leakage rate.
2. Choose KN100 rated dust filter cotton to use. Low protection rate will lead to physical harm.
3, choose silicone material is more comfortable. Suitable for long time wear, not easy to trigger allergic reactions. Hardness of the mask is easy to cause facial indentation.
4, the mask is divided into size, this is extremely important. Do not buy those so-called universal model mask. Easy to leak.
5, masks cover the mouth and nose, cover the mouth and nose, jaw 2 kinds, it is recommended to use the latter, relatively more comfortable.
6, it is recommended to choose a smooth breathing mask. Some masks are designed with double filter cotton, while the filter cotton has two sides, so the mask is relatively smooth breathing.