When many people buy masks, they find that the label is usually KN95 instead of N95. Is there a difference between KN95 and N95 masks? Can KN95 masks be used for first-line protection? A reporter from Science and Technology Daily interviewed Professor Jin Xiangyu, deputy director of the Industrial Textile Engineering Center of the Ministry of Education and director of the Department of Nonwoven Materials and Engineering of Donghua University. Presided over the completion of the development project of anti-SARS virus protective textiles against the SARS epidemic. One, is there a difference between KN95 and N95 masks? N95 is the certification level of American respirators, certified by the National Institute of Occupational Safety and Health (NIOSH). This type of mask can filter out more than 95% of non-oily particles (aerosol) under the specified air flow (85L/min), so it is named N95. And if it can filter more than 99% of the particulate matter (aerosol), it is called an N99 mask. In addition, corresponding to N95, KN95 is a mask certified by my country's GB2626-2006 Respiratory Protection Equipment Self-priming Filter Type Anti-Particulate Respirator Standard. KN95 and N95 masks have the same protection level, but they follow the testing standards of different countries. The KN95 copper mask
follows the Chinese standard, and the N95 mask follows the American standard. Both of them have a protection efficiency of not less than 95% for non-oily particles (sodium chloride particles for experimental use). Second, can KN95 masks be used for first-line protection? KN95 masks and N95 masks include both medical and non-medical types. Among them, KN95/N95 masks with medical signs can be used for the first-line protection of medical staff during the anti-epidemic period. Masks without medical signs are not recommended for medical staff and ordinary people can use them. Respirators that conform to GB19083 and above level 1 can not only achieve 95% filterability, but also prevent liquid penetration, and can be used for various operations in medical institutions. The batch of KN95 masks that the Hubei Red Cross raised doubts this time, if the content of the publicity is true, after checking with the health department, it is confirmed that the product cannot be used for the protection of first-line medical staff in designated hospitals for the treatment of new coronary pneumonia. It can be presumed to be in the KN95 masks. Non-medical category. 3. What is the difference between medical and non-medical masks in KN95/N95 masks? 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 for synthetic blood penetration , The parameter index of surface moisture resistance clarifies the protective effect of medical protective masks on blood, body fluids and other liquids. In layman's terms, it is like water droplets falling on a lotus leaf. The liquid cannot be soaked on the surface of the copper mask. This can block the medical staff from frequent contact with alcohol, blood, etc., and prevent it from quickly penetrating; rather than the medical type KN95 /N95 masks will not undergo this special treatment. The protective function of KN95 and N95 respirators 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. The material will be destroyed by contact with water, alcohol, etc. during application. The structure of the filter 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 copper mask is essential. Ordinary people are unlikely to encounter alcohol or blood. As long as they change their masks regularly, it will be harmless without this treatment on the outside. 5. How is the protective effect of KN95/N95 masks with breathing valves? KN95/N95 masks are also divided into breathing valves and non-breathing valves. For masks, air permeability and filtration efficiency are always a pair of contradictions. If the filtration effect is good, you will often feel suffocated. The breathing valve is designed to relieve suffocation. The exhalation valve and the inhalation valve are mechanical switches that close when inhaling, and open when exhaling. The air is screened through the filter layer and the valve opens when exhaling 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 that has not passed through the filter layer. Therefore, medical masks do not have breathing valves. At the same time, we also call on ordinary people to choose KN95/N95 masks or medical surgical masks without breathing valves during this anti-epidemic period, especially when the surrounding environment is harsh.
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