Advantages: very good ventilation; can filter toxic gases; can keep warm; can absorb water; It is very elastic and can be restored after stretching; the price is relatively low, and it is suitable for mass production; compared with other cloth masks, the mask cannot be cleaned; because the fibers are arranged in a certain direction, it is also easier to be Tear apart; compared to other textile masks, disposable masks are less strong and durable than other masks
Editing of use conditions There are various types of dust masks, and the selection must be based on different job requirements and working conditions. First of all, it should be selected according to 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 a full face mask or protection level should be used Higher respirators.
If the particulate matter is a highly toxic substance, carcinogen and radioactive, a filter material with a higher filtration efficiency should be selected. If the particulate matter is oily, be sure to select a suitable filter material. If the particles are needle-like fibers, such as slag wool, asbestos, glass fibers, etc., since the dust mask cannot be washed with water, the mask with tiny fibers may cause facial irritation at the facial seal and is not suitable for use.
For high-temperature and high-humidity environments, it is more comfortable to choose a mask with an exhalation valve. 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. Poison combination filter element. For environments where there is no particulate matter, but only some odors, choosing a dust mask with an activated carbon layer is much lighter than wearing a gas mask, such as some laboratory environments, but because the standard does not regulate the technical performance of such masks.
