Face mask is a kind of sanitary product, generally refers to a device that is worn on the nose and mouth to filter the air entering the nose and mouth, so as to block harmful gases, odors, and droplets from entering and exiting the wearer's mouth and nose. Face masks have a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent and when working in a polluted environment such as dust, wearing a mask has a very good effect.

Face masks are divided into medical masks and non-medical masks, (and the latest) civil sanitary masks. It is roughly divided into the following three categories:

N series: no time limit for protection of non-oily suspended particles

R series: Protect non-oily suspended particles and sweaty oily suspended particles for a period of eight hours

P series: protection of non-oily suspended particles and sweaty oily suspension

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