Since the outbreak of the new coronavirus pneumonia, not only Hubei Province has been short of masks, but mask resources across the country and even the world are also in short supply, because masks are the first line of defense against the virus.
Do you know that the mask you are wearing can really effectively block the virus? Masks made of PTFE medical mask filter material can effectively block viruses.
The filtration efficiency marked on the mask is not equal to the actual filtration efficiency after people wear it.
Whether there is air leakage around the mask, whether the nose bridge clip is tight with the nose, etc., directly affects the mask’s effectiveness in blocking particles.
Grow Staphylococcus aureus in broth and then dilute it with other liquids.
Use a sprayer to spray water mist containing Staphylococcus aureus into the airflow in the air duct upstream of the mask. The average particle size of the mist droplets is 3 microns (10 times the test particle size of the particles).
Sampling is taken from the upstream and downstream air ducts of the mask, and then incubated for 48 hours.
Comparing the bacterial colonies sampled before and after the mask, the “bacterial filtration efficiency” was obtained.
PTFE medical mask filter material is a polymer compound of tetrafluoroethylene. It is one of the materials with the best corrosion resistance in the world. Except for a few chemicals such as chlorine trifluoride and liquid chlorine, it can withstand all other chemical reactions. , insoluble in strong acids, strong alkali and organic solutions, and does not change in boiling nitrohydrochloric acid.
The temperature resistance range is -195℃～250℃, and the long-term use temperature is -100℃～250℃.
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