Conditions for using disposable masks

There are various types of disposable dust masks, and the selection must be tailored to different job requirements and working conditions.
Firstly, the selection should be based on the concentration and toxicity of the dust. According to GB/T18664 "Selection, use and maintenance of respiratory protective equipment", as a half face mask, all dust masks are suitable for environments where the concentration of harmful substances does not exceed 10 times the occupational exposure limit. Otherwise, full face masks or respirators with higher protection levels should be used.
If particulate matter belongs to highly toxic substances, carcinogens, and radioactive substances, the filter material with the highest filtration efficiency should be selected.
If the particulate matter is oily, it is necessary to choose suitable filtering materials.
If the particulate matter is needle shaped fibers, such as slag wool, asbestos, fiberglass, etc., dust masks cannot be washed with water, and masks with tiny fibers attached are prone to facial irritation in the sealed area and are not suitable for use.
For high temperature and high humidity environments, choosing a mask with an exhalation valve will be more comfortable. Choosing a mask that can remove ozone for welding can provide additional protection, but if the ozone concentration is higher than 10 times the occupational health standard, the mask can be replaced and equipped with dust and toxic combination filter elements. For environments where there are no particulate matter but only certain odors, choosing a dust mask with an activated carbon layer is much lighter than wearing a gas mask, such as in some laboratory environments, but national standards do not provide technical performance specifications for such masks.