There are many kinds of medical masks. Common medical masks for disposable non-woven masks, gauze masks, and special effects antivirus masks.
1, disposable non-woven mask, the number of layers for more than three, to isolate bacteria, dust, and one-time use, safe and reliable, no secondary infection risk.
2, gauze masks, the most has been used in the mask type, gauze masks in the field of health care, scientific research has a very wide range of applications.
3, anti-virus masks, mainly in a special material, the middle plus filter layer, the general filter layer using activated carbon felt or meltblown cloth. There is sterilization, sterilization effect.

According to the performance characteristics and scope of application to the points, medical masks can be divided into: medical protective masks, medical surgical masks, general medical masks.

1. Medical protective masks
In line with GB19083-2003 "medical protective masks technical requirements" standard, important technical indicators, including non-oily particles filtration efficiency and airflow resistance:
(1) Filtration efficiency: The filtration efficiency of aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol was less than 95% at air flow rate (85 ± 2) L / min, that is, N95 (Or FFP2) and above.
(2) suction resistance: in the above flow conditions, suction resistance does not exceed 343.2Pa (35mmH2O).

2. Medical surgical masks
In line with YY 0469-2004 "medical surgical mask technical requirements" standard, important technical indicators, including filtration efficiency, bacterial filtration efficiency and respiratory resistance:
(1) Filtration efficiency: The filtration efficiency of aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol was not less than 30% at air flow rate (30 ± 2) L / min.
(2) Bacterial filtration efficiency: Under normal conditions, the filtration efficiency of Staphylococcus aureus aerosol with an average particle diameter of (3 ± 0.3) μm was not less than 95%
(3) respiratory resistance: in the filter efficiency flow conditions, suction resistance does not exceed 49Pa, breath resistance does not exceed 29.4Pa.

3. General medical masks
Compliance with the relevant registered product standards (YZB), the general lack of particle and bacterial filtration efficiency requirements, or the efficiency of particle and bacterial filtration requirements lower than medical surgical masks and medical protective masks.