According to performance characteristics and scope of application, medical masks can be divided into: medical protective masks, medical surgical masks, and ordinary medical masks.
1. Medical protective mask
It complies with the GB19083-2003 "Technical Requirements for Medical Protective Masks" standard. Important technical indicators include non-oily particle filtration efficiency and airflow resistance:
(1) Filtration efficiency: Under the condition of air flow (85±2)L/min, the filtration efficiency of sodium chloride aerosol with aerodynamic median diameter (0.24±0.06)μm is not less than 95%, which is in line with N95 (Or FFP2) and above.
(2) Inspiratory resistance: Under the above flow conditions, the inspiratory resistance does not exceed 343.2Pa (35mmH2O).
2. Medical surgical masks
Comply with YY 0469-2004 "Technical Requirements for Medical Surgical Masks" standard, 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 aerodynamic median 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 95%;
(3) Breathing resistance: Under the condition of filtration efficiency and flow rate, the inhalation resistance does not exceed 49Pa and the exhalation resistance does not exceed 29.4Pa.
3. Ordinary medical masks
Comply with the relevant registered product standards (YZB), generally lack the filtration efficiency requirements for particles and bacteria, or the filtration efficiency requirements for particles and bacteria are lower than medical surgical masks and medical protective masks.
