Can I use a non-sterile mask?

Can I use a non-sterile mask? It can be used in some dust-proof places, but it must not be used for medical treatment.

Recently, some netizens questioned the "non-sterility" of masks after receiving them by lottery. "Non-sterile" means that masks can't prevent bacteria? No, actually, this is the truth.

Medical masks include disposable medical masks, medical surgical masks and medical protective masks. Three kinds of medical masks all have microbial indicators, including two situations: first, non-sterile masks (marked as "non-sterile" by some enterprises) must meet the microbial control standards, that is, a certain amount of bacteria is allowed, but it must be within the controllable range; The second is a sterile mask, and no bacteria are allowed. Both non-sterile medical masks and sterile medical masks have protective functions, which can block droplets and achieve the purpose of preventing cross-infection.