How Many Times Can Disposable Masks Be Used? Are Gauze Masks Useful? Donghua Experts Have Come To Explain In Detail!

refore, remember to "outer blue and inner white", otherwise it will be counterproductive and will instead attract droplets. Jin Xiangyu explained that such a design is actually for the practical needs of medical workers, because the blue surface is not white, and under high light conditions such as shadowless lights, it is not easy to cause dazzling reflections and reduce eye fatigue of medical workers.

As for other wrong ways of wearing masks,

Teacher Jin has something to say:

1. Are traditional gauze masks useful?

useless. After the SARS campaign, Jin Xiangyu’s team conducted special experiments in a laboratory environment. They used 12 or even 18 layers of gauze masks to superimpose. As a result, the particulate matter filtration rate was only 96%, which was 95% of the standardized single-layer masks. The filtration rate is almost the same, "What's more, in reality, it is impossible to repeatedly wear more than a dozen layers of gauze masks."

2. Are anti-smog masks useful?

It's useless. The design standards of anti-smog masks are different from those of medical masks, and they are not used to intercept viruses. If the built-in filter material is exposed to viruses, it cannot be properly disposed of, and it is prone to secondary pollution. In addition, anti-smog masks often have decorative and warm design. It is not recommended to use anti-haze masks in the epidemic.

3. Are masks with valves useful?

It is also not recommended. Masks with valve function are mainly used for dust prevention. Jin Xiangyu told reporters that the valve is a "breathing valve" after leaving the dusty environment, and it can breathe smoothly after opening. However, this valve has a risk of malfunctioning, and if large particles are stuck, it cannot prevent the inhalation of the virus.

4. Is it more useful to wear two disposable masks?

It's useless. Some people are afraid that the mask is thin and wear two disposable masks. Jin Xiangyu said that it is completely unnecessary. Because they have also done experiments to confirm that the "interception rate" of overlapping disposable masks against the virus is also 95%. Moreover, double-layer masks greatly increase the breathing resistance and produce a feeling of "stuffy" discomfort.