First of all, antibacterial masks must have an antibacterial test report issued by a national testing agency. First, they must meet antibacterial standards, and second, antibacterial performance must have a relative time guarantee. The validity period of a mask is about three years, so the antibacterial function must also be effective for three years, which limits many antibacterial technologies (unless the mask validity period is reduced). At present, there are not many antibacterial products on the market. Our company has antibacterial test reports from national institutions.