Speaking of surgical masks, I believe that a lot of people are not strange, surgery and dressing change operations need to wear, but a lot of people often do not know what surgical masks use errors?

Surgical masks must meet YY 0469-2004 technical requirements for surgical masks, and important technical indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance:

1. Filtration efficiency: under the condition of air flow (30±2) L/min, the filtration efficiency of the aerodynamics median diameter (0.24±0.06) of livable sodium chloride aerosol is not less than 30%;

2. Bacterial filtration efficiency: under the stipulated conditions, the filtration efficiency of staphylococcus aureus aerosol with an average particle diameter of (3±0.3) is not less than 95%;

3. Respiratory resistance: under the condition of filtration efficiency flow rate, the inspiratory resistance should not exceed 49Pa, and the expiratory resistance should not exceed 29.4pa.

Surgical masks must meet YY 0469-2004 technical requirements for surgical masks, and important technical indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance:

1. Filtration efficiency: under the condition of air flow (30±2) L/min, the filtration efficiency of the aerodynamics median diameter (0.24±0.06) of livable sodium chloride aerosol is not less than 30%;

2. Bacterial filtration efficiency: under the stipulated conditions, the filtration efficiency of staphylococcus aureus aerosol with an average particle diameter of (3±0.3) is not less than 95%;

3. Respiratory resistance: under the condition of filtration efficiency flow rate, the inspiratory resistance should not exceed 49Pa, and the expiratory resistance should not exceed 29.4pa.