The current classification of dust masks by mask machines is divided into two categories according to their structure and working principle: concentrated attention filters provide air.

 

Self-absorption filter: It is called a filter mask work, which contains harmful air that is inhaled through the evolution of the mask filter media.

 

First of all, the concentration of dust and toxic should be selected. As a half-mask filter, dust masks are suitable for all levels of hazardous substances not exceeding 10 times the occupational exposure limit environment, otherwise you should use a frontal respirator or a higher level of protection. If the particles are highly toxic, carcinogenic and radioactive, you should choose the filter material with the highest level of filtration efficiency. If you have oily particles, be sure to choose an appropriate filter material. If the particulate matter is needle-like fiber, such as slag wool, asbestos, glass fiber, etc., it cannot be washed, because the sealing part of the dust mask and the small fiber of the mask glue can easily cause facial irritation and is not suitable for use.

 

For different types of masks, the protection level has been assigned a coefficient by using their research, which can help us choose a mask. The values ​​of APF masks designated by different countries or institutions are different, but the meaning is the same. The air purification half mask assigns a protection factor of 10, which represents half of the face. When you wear a mask, it can help you reduce the concentration of harmful substances by 10 times; similarly, the air purification is full of 100, and the full type APF electric blower type is 1000, etc. .

 

We wear masks to protect the working environment for the purpose of reducing the concentration level of hazardous substances and allowable exposure levels. When choosing a mask for hazardous substances to understand the actual exposure of the value, the allowable exposure value of related hazardous substances is the number and the oxygen concentration. After understanding, for each mask according to the designated protective factors, the mask machine has now handled the production of masks well.