Introduction of various face masks
1. Cotton mask
Advantages: It can be cleaned and used repeatedly, saving costs.
Disadvantages: Saliva is left in the part of the mask that touches the nose and mouth. If it is not cleaned diligently, it is easy to breed bacteria, which does not meet the hygiene requirements; it cannot effectively filter the smaller particles, and most of them have not passed the international safety certification, so wear them for protection The effect is poor and the virus cannot be stopped. Some cotton masks do not even have a nose bridge. The bridge of the nose cannot be fixed well, and the air leakage on both sides of the nostril is too large.
2. Disposable flat mask
Advantages: It can effectively filter viruses, the protection effect is not less than 90%, and the cost is the lowest of the three masks.
Disadvantages: In areas with high crowd density or used for medical surgery, disposable flat masks are worn, and the degree of protection is not high enough.
3. N95 mask
Advantages: the best protection effect, can filter out more than 95% of particles and viruses, suitable for medical surgery.
Disadvantages: high cost, poor air permeability, not suitable for children to wear.