Unopened face masks have a shelf life, and their validity period is generally 2-3 years. That is to say, when the face mask is kept in the original packaging and the storage environment temperature is between -20℃ and +30℃, and the relative humidity does not exceed 80%, the shelf life of the face mask is 2-3 years from the date of production.
If it is expired, it is best not to use it. Moreover, the length of the mask's life is actually determined by many aspects such as fabric material, technology, and user habits. Because the mask is in direct contact with the face and mouth, it has good breathability, softness, elasticity and durability. The face mask is a sanitary product, generally refers to a device worn on the mouth and nose to filter the air entering the mouth and nose, so as to block harmful gases, odors, and droplets from entering and exiting the wearer's mouth and nose, and is made of gauze or paper.
The face mask has a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent, wearing a face mask has a very good effect when working in a polluted environment such as dust. Therefore, when using a mask, it must be used up before the validity period.