There are many advantages and disadvantages of disposable masks. For example, this kind of mask has filtering effect on common poisonous gases, and it has a good hand feeling. It is very soft to touch and won't hurt our skin. It has good elasticity. Even after stretching, it is easy to restore. Moreover, the price of disposable masks is relatively low, which is often used in some large factories and mines. However, we should pay attention to the limitation of the validity period of disposable masks, not to mention repeated use. How long is the validity period of disposable masks? New Wellcome tips: disposable masks can not be reused, and they need to be replaced after 6-8 hours of use. Moreover, the two sides of the mask can not be used alternately, because the outer layer of the mask often accumulates a lot of dust, bacteria and other dirt in the outside air, while the inner layer blocks the exhaled bacteria and saliva, if the two sides are alternately used If you use it, you will directly stick some dirt and other substances on the outer layer to the mouth and nose, which will enter the human body through the respiratory tract and affect the health of the human body. Note: after using the dust mask, you should put it into a clean envelope, and fold it close to your mouth and nose. Do not put it into your pocket or hang it around your neck. In addition, we should pay attention to the expiration date of disposable respirator. The expired one should not be used. It can only be used once and must be destroyed after use. If the package is damaged during the purchase, it must not be purchased or used. Pay attention to the production date when purchasing, and make sure to purchase the products produced in the near future. Disposable masks must be known to all, it can bring great convenience to our lives. Especially in haze weather, wearing disposable masks can prevent air pollution. Children have poor immunity and are vulnerable to virus infection. Wearing disposable children's masks can help prevent viruses and go out at ease. What's the role of disposable masks? Adaptive groups: disposable masks cover a wide range of places and areas, such as schools, hospitals, food processing, etc. These are densely populated places, and viruses are easy to infect. Therefore, when you wear disposable masks, you not only protect yourself, but also protect others, which greatly reduces the spread of viruses and diseases. In particular, some manufacturing or processing factories are most likely to have dust, and these dust into the respiratory tract on everyone's safety risks, but also has a great impact on the lungs. Through the use of disposable anti haze mask can prevent these dust into the respiratory tract, to avoid the occurrence of various diseases.