Conditions Of Use For Disposable Masks
There are various types of disposable dust masks, which must be selected according to different operating needs and working conditions.
First of all, it should be selected according to the dust concentration and toxicity. According to GB / T18664 "Respiratory protective equipment selection, use and maintenance", as a half 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 mask or protection level should be used Higher respirators.
If the particulate matter is highly toxic, carcinogenic and radioactive, the filter material with the highest filtration efficiency should be selected.
If the particulate matter is oily, be sure to select a suitable filter material.
If the particulate matter is needle-shaped fiber, such as slag wool, asbestos, glass fiber, etc., because the dust mask can not be washed, the mask with the micro fiber stuck to the face sealing part is easy to cause facial irritation 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. A mask that can remove ozone can be used for welding to provide additional protection. However, 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 certain odors, it is much lighter to choose a dust mask with an activated carbon layer than a gas mask, such as some laboratory environments, but due to national standards, technical performance specifications for such masks are not .
Everything has its two sides, and the same is true for disposable masks. It has some advantages while having some advantages:
Advantages: Very good ventilation; can filter toxic gases; can keep warm; can absorb water; can be waterproof; flexible; will not be messy; feels very good and very soft; compared to other masks, the texture is lighter; Very elastic, can be restored after stretching; the price is relatively low, suitable for mass production;
Disadvantages: Compared with other fabric masks, disposable masks cannot be cleaned; because the arrangement of their fibers has a certain direction, they are easier to be torn apart; compared with other textile cloth masks, the strength and strength of disposable masks Durability is worse than other masks.