2020 Best Disposable Medical Surgical Face Mask of 3 Ply ...
Only when the disposable face mask meets the following requirements it can be called the medical Surgical face mask Filtration efficiency Under the condition of air flow (30 ± 2) L / min, the filtration efficiency of the Surgical Face Mask for aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol is not less than 30%;