The difference between medical protective masks and medical surgical masks

Medical protective masks require a certain degree of anti-infection effect, while most medical surgical masks only need basic protective functions. In addition to the basic function of preventing germs, they are required to prevent blood, body fluids and splashes during invasive operations. It has a medium degree of protection and a certain degree of respiratory protection. The filtration efficiency of medical protective masks: 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. It can block airborne infectious agents with a diameter of <5μm or close contact with infectious agents transmitted by droplets. The latter only needs to block 30% of the aerosol at a relatively low air flow rate.