It is currently believed that both N95 masks and medical surgical masks can effectively protect against the new coronavirus when worn correctly and reasonably. Structurally, the filter layer of N95 masks and medical surgical masks is made of non-woven fiber material. This fiber material can make tiny particles adhere to its fibers, and the breathing air is not obstructed and can be easily Pass the filter material.

The filtering mechanism is mainly the inertial collision, diffusion and electrostatic adsorption of tiny particulate matter. The prerequisite for the re-use of the mask after disinfection is that the disinfected mask can neither affect the free passage of breathing air flow nor destroy the filtering mechanism of the mask. So what kind of disinfection method can meet the above two points?

For the effect of disinfection methods on the filtration mechanism of N95 masks and medical surgical masks, studies have compared five disinfection methods: oven dry heat disinfection, alcohol disinfection, steamer moist heat disinfection, high temperature and high pressure disinfection and ultraviolet disinfection. Find:

1. Dry heat disinfection (heating at 70 degrees Celsius for 30 minutes) has the least impact on the filtering effect of the mask, and the filtering effect can basically be maintained above 95%.

2. The disinfection method of spraying alcohol on the mask will destroy the electrostatic adsorption effect of the mask, but make the filtration efficiency of the mask lower than 95%.

3. Other methods such as steamer damp heat method, high pressure and high temperature sterilization method will also make the filtration efficiency of the mask lower than 95%, and high temperature and high pressure will also seriously deform the mask.

4. The new coronavirus is sensitive to ultraviolet rays, and ultraviolet disinfection does not affect the filtering effect of the mask, but the inactivation effect of the virus that cannot be directly exposed to the mask fiber is unknown, so it is not recommended. At present, there is no reliable data to confirm whether the mask can maintain the protective effect before disinfection after ozone disinfection.

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