Standards and important technical indexes of medical masks
1. Medical protective mask
It conforms to GB19083-2003 technical requirements for medical protective masks. Important technical indexes include filtration efficiency of non oil particles and air flow resistance
(1) Filtration efficiency: under the condition of air flow (85 ± 2) l / min, the filtration efficiency of sodium chloride aerosol with median diameter (0.24 ± 0.06) μ m in aerodynamics shall not be less than 95%, that is to say, it shall meet the grade of N95 (or FFP2) and above.
(2) Suction resistance: under the above flow conditions, the suction resistance shall not exceed 343.2pa (35mmh2o).
2. Medical surgical mask
It conforms to YY 0469-2004 technical requirements for medical surgical masks. 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 sodium chloride aerosol with median diameter (0.24 ± 0.06) μ m in aerodynamics 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) μ m shall not be less than 95%;
(3) Respiratory resistance: under the condition of filtration efficiency flow, the inspiratory resistance shall not exceed 49pa, and the expiratory resistance shall not exceed 29.4pa.
3. General medical mask
In line with the relevant registered product standards (yzb), the filtration efficiency requirements for particles and bacteria are generally lacking, or the filtration efficiency requirements for particles and bacteria are lower than those for medical surgical masks and medical protective masks.
