Introduction of N95 Mask
The N95 mask is one of nine particulate protective masks certified by NIOSH (National Institute for Occupational Safety and Health). N95 is not a specific product name. As long as it meets the N95 standard and passes the NIOSH review, it can be called a N95 mask, which can filter particles with an aerodynamic diameter of 0.24 ± 0.6 μm (physical diameter 0.075 μm ± 0.020 μm). More than 95%.
Official Guidelines for Wearing Scientific Masks
Chinese name N95 type mask Foreign name N95 face-mask certification agency NIOSH Class protective masks Classification Cup cover type, folding function The filtration efficiency of aerodynamic diameter 0.075µm ± 0.020µm particles can reach 95% or more
Introduction of N95 mask
Function and use
The US Department of Labor has recommended that medical personnel use N95 masks to prevent microbial airborne diseases such as influenza and tuberculosis.
According to the shape of the mask, it is often divided into two types: cup cover type and folding type.
"95", "99" and "100" refer to the level of filtration efficiency when tested with 0.3 micron particles. "95" means that the filtration efficiency is above 95%, "99" means that the filtration efficiency is above 99%, and "100" means that the filtration efficiency is above 99.7%.
In addition to the filtering efficiency of the N95 mask, the closeness of the mask to the face is one of the important factors determining the effectiveness of the mask. Different types of masks have large differences in their suitability to the human face. Therefore, before using a mask, the suitability of the mask should be checked first. During the tightness test of the wearer's face, ensure that air can pass in and out through the mask when it is close to the edge of the face.
Dust and Medical
"Approaching the N95 mask production line" reported: "Workers are packing medical protective N95 masks (photo taken on February 8). For the past few days, the only medical protective N95 mask manufacturer in Liaoning Province-Shenyang Shengshi Medical Technology Co., Ltd Continuous production for more than 20 hours a day, to ensure daily production capacity of more than 20,000 masks, to supply the epidemic prevention line in Hubei Province and the epidemic prevention line in Liaoning Province. "
Wash your hands before wearing a mask, or avoid touching your face with the inside of the mask during wearing the mask to reduce the possibility of the mask being contaminated.
Distinguish the inside and outside of the mask, and up and down.
Do not squeeze the mask with your hands. The N95 mask can only isolate the virus on the surface of the mask. If you squeeze the mask with your hands, the virus will wet the mask with the droplets, which will easily cause virus infection.
The protective mask must be close to the user's face. The user must shave his beard to ensure that the mask can fit on the face. The beard and anything placed between the mask seal and the face will cause the mask to leak.
Masks have been used longer than recommended.
The government has not established safe exposure limits for pathogenic microorganisms, and respiratory protection can only reduce the risk of disease, but it cannot eliminate the risk.
Choice of masks
Choose the right mask
Medical protective masks should be the first choice for medical workers, and ordinary degreasing gauze masks should be the first choice for ordinary citizens to use in their daily lives. In special occasions, such as visiting doctors and visiting patients, it is better for ordinary citizens to choose medical masks.
Choose a qualified mask
When choosing a mask, you need to see whether there is a trade name on the package, whether there is information about the manufacturer or supplier, whether there is a mask certificate or instructions for use. Disposable masks must also have a one-time identification, and reusable medical protective masks must also indicate the method of sterilization. In general, ordinary gauze masks must be marked as normal or disinfected. The materials used for masks should be free of odors and harmless to the human body, especially those in contact with the human face. They should be non-irritating and allergic.
Don't forget to check the appearance when choosing a mask
This is a problem that we tend to ignore when choosing a mask. First of all, we must check whether the packaging of the mask is complete and whether it is damaged. There must be no holes or stains on the surface of the mask. Medical protective masks should not have exhalation valves. For close-fitting arch masks, the lateral diameter is not less than 14cm, and the longitudinal diameter is not less than 14cm. The length of the medical protective rectangular mask is not less than 17cm, and the width is not less than 17cm. The number should not be less than 12 layers. In addition, we must remind everyone that if you choose a medical mask, remember to have a nose clip. The nose clip is made of bendable plastic material and the length is not less than 8.5cm.
The hot-selling N95 masks on the Internet can reach 95% after testing and filtering. However, for N95 masks, doctors remind citizens to pay attention: "In theory, the more tightly the mask's protective material is, the better the effect of blocking particulate matter. On the other hand, the closer the mask is, the harder it is to breathe, especially for patients with cardiovascular disease Poor wearing can also cause dizziness and difficulty breathing due to lack of oxygen, so choose more carefully. "