Size:20pcs About N95 masks:N95 mask can isolate smaller particles and stick to the face, it is not easy to leak air from the surroundings, and the filtration efficiency of particles can reach 95% under standard conditions.ZhThe n95 mask is not a disposable mask. In this particular case (shortage of resources), it can be reused. But there are conditions:1. When n95 is contaminated with saliva, blood, tears and other body fluids, it must be replaced2. The user obviously feels that he has more difficulty breathing, and must be replaced3. Mask is damaged and must be replaced4. It is recommended to replace after 4 times.However, masks cannot be reused if someone goes to the hospital, comes into contact with an infected person, or is suspected of being infected.Zh5-layer filter function:● First layer: Spunbond cloth, filter micron-level dust● The second layer: filter industrial pollutants, car exhaust, used fireworks powder allergy● Third layer: Activated carbon cloth, benzene and smaller filter dust function● Fourth layer: high density filter, smaller material● The fifth layer: spunbond, filtering out various harmful substances
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