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What is the difference between medical and non-medical masks in KN95/N95 masks?

Update:22 Feb
The main difference is that the outer surface of medical masks is hydrophobically treated.
The medical surgical masks of GB19083-2010 and YY0469-2011 clearly put forward the requirements of "synthetic blood penetration", and the parameter index of "surface moisture resistance" clarifies medical protective masks The protective effect of blood and body fluids. In layman's terms, it is like water droplets falling on a lotus leaf. The liquid cannot be soaked on the surface of the mask. This can block the medical staff from frequent contact with alcohol, blood, etc., and prevent it from quickly penetrating; not the medical type KN95 /N95 masks will not undergo this special treatment.

The protective function of KN95 and N95 protective masks is the filter layer. The filter layer is made of polypropylene melt-blown microfiber electret material. The outer surface of the mask has not been treated with hydrophobic treatment. Contact with water, alcohol, etc. will destroy the material during application. The structure greatly reduces the filtering effect. What's more, the blood often contains bacteria, viruses, etc., and the application scenarios of the hospital determine that the medical staff will be exposed to the patient's blood environment with a high probability. Therefore, the hydrophobic treatment of the surface of the medical mask is essential. However, ordinary people are unlikely to encounter alcohol and blood. As long as they change their masks regularly, it will not hurt their outside without this treatment.

What is the protective effect of the KN95/N95 mask with breathing valve?
KN95/N95 masks are also divided into breathing valve and non-breathing valve. For masks, air permeability and filtration efficiency are always a contradiction. If the filtration effect is good, you will often feel more suffocated. The breathing valve is designed to relieve suffocation.

The exhalation valve and the inhalation valve are mechanical switches. They close when you inhale and open when you exhale. The air is "sifted" through the filter layer. When you exhale, the valve opens to reduce resistance. The problem is that people don't know whether this mechanical switch will suddenly break when worn or if it is caught by fine particles, allowing harmful particles to enter the air carrier without the filter layer. Therefore, medical masks have no breathing valve. At the same time, we also call on ordinary people to choose KN95/N95 masks or medical surgical masks without breathing valves during the anti-epidemic period, especially when the surrounding environment is harsh.

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