Medical mask standard
1. Medical protective mask
It complies with GB19083-2003 "Technical Requirements for Medical Protective Masks". The 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 aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol is not less than 95%, it meets N95 (or FFP2) and above grade.
（2） Inspiratory resistance: Under the above conditions, inspiratory resistance does not exceed 343.2Pa (35mmH2O).
2. Medical surgical mask
It comply with YY 0469-2004 "Technical Requirements for Medical Surgical Masks", the 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 aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol is not less than 30%;
（2）Bacterial filtration efficiency：Under the specified conditions, the filtration efficiency of the Staphylococcus aureus aerosol with an average particle diameter of (3 ± 0.3) μm is not less than 95%;
（3）Respiratory 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
It comply with the relevant registered product standard (YZB), generally lacking 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.