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Accord with YY, 0469-2004 standard for medical surgical masks technical requirements and important technical indexes including filtration efficiency, bacteria filtration efficiency and respiratory resistance:
Filter efficiency: 1. The air flow (30 + 2) under the condition of L/min, the median aerodynamic diameter (0.24 + 0.06) microns of sodium chloride aerosol filtration efficiency of no less than 30%;
2. Bacteria filtration efficiency: under prescribed conditions, the average particle diameter (3 + / - 0.3) microns of staphylococcus aureus aerosol filtration efficiency of not less than 95%;
Breathing resistance: under the condition of the efficiency of filtering flow, inspiratory resistance less than 49 Pa, expiratory resistance is not more than 29.4 Pa.
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