Civil sanitary masks are used to filter the air entering the nose and mouth. Civil sanitary masks prevent harmful gases, odors and water droplets from entering and leaving the wearer's nose and nose. Civil hygiene masks are mainly divided into cotton masks, non-woven masks, polymer masks, activated carbon powder filter masks, and activated carbon fiber felt masks.
Protective masks are divided into air-supply protective masks and filter-type protective masks. Air filter masks can filter particles in the air, and block droplets, blood, body fluids, toxic gases, and secretions. Air-supply protective masks refer to air-supply protective masks in chemical factories, fire sites, or military chemical hazards, which are ordinary individual soldier protective masks.