What are the indicators of medical surgical masks?
1) Filtration efficiency: under the condition of air flow (30±2) L/min. The filtration efficiency of sodium chloride aerosol with median aerodynamic diameter (0.24±0.06) μm is not less than 30%. 2) Bacterial filtration efficiency: Under specified conditions, the filtration efficiency of Staphylococcus aureus aerosol with an average particle diameter of (3±0.3) μm is not less than…