Original title: 3 minutes to understand "masks": "strategic materials" under the "novel coronavirus epidemic" can prevent the virus Under the "novel coronavirus epidemic", masks have become the most popular "hot selling items". From the outbreak of SARS in China in 2003, to the bird flu in 2004, to the 2009 H1N1 flu in 2009, every epidemic has forced ordinary people to flock to masks, and even rush to buy masks. Especially at the beginning of 2020, the COVID-19 spread all over the world, and the use and popularization of masks reached an unprecedented peak again. According to the World Health Organization, since the outbreak of COVID-19, the global demand for medical masks has increased by 100 times and the price has increased by 20 times. Under the severe epidemic situation, although the major pharmacies did not queue up to buy masks, people still tried their best to buy and hoard masks through the Internet and the circle of friends, and even were cheated to buy masks in bulk. The demand for masks was so large that it was even described as "strategic materials under the epidemic situation". I think everyone is familiar with masks, but it can be said that they are particularly unfamiliar, because a small mask not only has a lot of cold knowledge, but also can help us resist the virus, so it is necessary to spend 3 minutes here to give you some knowledge about masks, I hope it will be useful to you! Masks, also known as breathing masks, are generally worn in the mouth and nose, used to filter air in and out of the nose, in order to prevent harmful gases,Full Body Disposable Coverall, odors and droplets from entering and leaving the wearer's mouth and nose. They are generally divided into three layers, namely, waterproof layer, filter layer and absorbent layer. Masks, also known as breathing masks, are generally worn in the mouth and nose, used to filter air in and out of the nose, in order to prevent harmful gases, odors and droplets from entering and leaving the wearer's mouth and nose. They are generally divided into three layers, namely, waterproof layer, filter layer and absorbent layer. Many people may not know that masks can be roughly divided into seven types: gauze masks, Virus Prevention Mask 3 Ply with Earloop ,Against Bacteria Breathable KN95 Face Mask, disposable medical masks, activated carbon masks, surgical masks, N95 protective masks, three-dimensional masks and PM2.5 anti-haze masks. Generally speaking, medical staff often use surgical masks, which can not only prevent harmful substances from entering the wearer's mouth and nose, but also prevent the wearer's respiratory secretions from contaminating the environment. Expand the full text 1. Gauze mask. Gauze masks, which can only filter larger particles, are most commonly worn by cleaners. They can effectively block 80% of the wearer's droplets and about 10% -20% of air pollutants. However, they have poor facial sealing and low anti-toxic efficiency. They can not be used as medical protective equipment. Their main function is to keep warm. 2. Disposable medical mask. For the general protection of medical staff, the bacterial filtration efficiency of the mask is not less than 95%, which is more suitable for cleaning work. 3. Activated carbon mask. It can absorb organic gases and toxic dust, but it does not have bactericidal effect. It is suitable for spray painting or spraying pesticides. It can block 80% of droplet infection and 30% -80% of air pollutants. It can also reduce odor. It should be noted that if you wear an activated carbon mask, you should change it immediately if you feel that you need to breathe hard or can't absorb odor. 4. Surgical mask. Surgical masks are most commonly used in operating rooms. They have a high level of protection. They can block 90% of sub-micron particles. They are suitable for patients with cold, fever and cough symptoms. After use, they can block 90% of droplet transmission and 30% -80% of air pollutants. Surgical masks should be changed daily, but should be replaced immediately if they are damaged or stolen. 5. N95 protective mask. Primarily to reduce, but not entirely eliminate, the risk of health care workers being exposed to airborne diseases. It has the best protective effect, which can block more than 95% of sub-micron particles and 80% -99.97% of air pollutants. However, it is easy to feel poor breathing when using, not suitable for ordinary people to wear for a long time, not recommended for children under 7 years old to wear in order to avoid dyspnea, and not suitable for repeated use. 6. Three-dimensional mask. It belongs to a new mask with a three-dimensional structure. We can often see stars wearing a variety of fashionable and generous three-dimensional masks, although they look good, but there is no effect of droplet isolation, or even can not block the haze, can only block pollen to a certain extent.
7. PM2.5 anti-haze mask. It can block particles with particle size less than or equal to 2.5 microns in the air, which has a certain effect on virus prevention and can effectively prevent droplet transmission, but it is mainly used to prevent haze. Finally, let's talk about the correct way to wear the most widely used disposable medical masks: 1. Distinguish between inside and outside: blue is outside, white is inside; fold down is outside, fold up is inside. 2. Make a clear distinction between the upper and lower parts: the metal soft strip is always the upper part. 1. Distinguish between inside and outside: blue is outside, white is inside; fold down is outside, fold up is inside. 2. Make a clear distinction between the upper and lower parts: the part with soft metal strips is always the upper part. The "new coronavirus" is a tough battle that is being waged across the country and even the world. Early detection, early isolation and early diagnosis are the responsibilities of government departments and medical institutions. But for us ordinary people,KN95 Face Mask, the most important thing is not to get together, wash our hands frequently, and wear masks correctly when we go out! Return to Sohu to see more Responsible Editor:. zjyuan-group.com