It is recommended not to use the mask after it expires. For medical surgical masks, they are sterilized and sterile when they are made, and bacteria are easy to breed when they expire. Moreover, if the mask exceeds the expiration date, the filtration efficiency and protective performance of the filter material will also be reduced, so it is unable to effectively isolate virus infection. With the aggravation of haze and virus invasion in urban life, masks have become a must in our life. They are often worn in places with a large flow of people or serious haze. However, masks also have a certain service life. Although they are not imported directly like food, they will also have an adverse impact on the human body.
General masks are not edible when they are expired. For medical surgical masks, they are sterile when they are made. When they are expired, they are very easy to breed bacteria. Once the masks exceed the validity period, the filtering effect and protective performance of their filter materials will be reduced, and their continued use can not effectively prevent the infection of viruses and bacteria.
At the beginning of 2020, the new coronavirus is rampant. At this time, we should carefully check when buying masks to avoid buying expired masks, otherwise it is likely to bring danger to ourselves, and businesses selling expired masks should be severely punished.