الوصف

In line with YY ********4 technical Requirements for Surgical Masks

1. Filtration efficiency: The filtration efficiency of the aerodynamics median diameter (0.*4±0.*6) m sodium chloride aerosol was not less than *0%;

2. Bacterial filtration efficiency: the filtration efficiency of staphylococcus aureus aerosol with average particle diameter of (3±0.3) m was not less than *5%;

3. Respiratory resistance: Under the filtration efficiency flow condition, the inhalation resistance shall not exceed *9Pa and the exhalation resistance shall not exceed *9.4Pa.

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