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Original title: Differences between medical masks, N95 masks and KN95 masks, and guidelines for the correct use of masks In order to let everyone not buy masks blindly and not spend money unjustly! Xiaozhen has collected the differences between different masks for your reference! Fight the virus together and do a good job of protection! Can be shared with those in need! N95 mask 1 Implementation of standards GB262606 Airtightness OK Expand the full text Particle Filtration Efficiency (PFE) ≥95% Bacterial Filtration Efficiency (PFE) Not stated Filtering effect At least 95% of very small particles (on the order of 0.3 microns) are blocked. Use scenarios Used to protect all kinds of particulate matter Service life 6-8 hours, 24-36 hours in case of shortage Characteristic Flame retardancy requirements; leakage rate requirements; respiratory resistance requirements; dead space requirements; air tightness requirements, etc. surgical mask 2 Implementation of standards YY046911 Airtightness General Particle Filtration Efficiency (PFE) ≥30% Bacterial Filtration Efficiency (PFE) Not less than 95% Filtering effect Generally, it can filter particles of about 5 microns, the outer layer has a waterproof layer to prevent droplets from entering, the middle layer is a filter layer, and the inner layer is a veneer layer. Use scenarios Worn by clinical staff during invasive operation, etc. Service life Replace after 4 hours of general use Characteristic Maximum blood permeability requirement (120mmHg) Medical disposable mask 2 Implementation of standards YY046911 Airtightness General Particle Filtration Efficiency (PFE) ≥30% Bacterial Filtration Efficiency (PFE) Not less than 95% Filtering effect Generally, it can filter particles of about 5 microns,Full Body Disposable Coverall, the outer layer has a waterproof layer to prevent droplets from entering, the middle layer is a filter layer, and the inner layer is a veneer layer. Use scenarios Worn by clinical staff during invasive operation, etc. Service life Replace after 4 hours of general use Characteristic Maximum blood permeability requirement (120mmHg) Cotton mask 4 Implementation of standards No unification Airtightness Slightly worse Particle Filtration Efficiency (PFE) Not stated Bacterial Filtration Efficiency (PFE) Not stated Filtering effect Only large particles such as dust,Virus Prevention Mask 3 Ply with Earloop, powder or pollen can be filtered. Use scenarios Protection for daily life Service life Short protection time, not specified Characteristic Can be repeatedly cleaned Guidelines for the correct use of masks (1) Types of masks and objects of use: 1. Disposable medical mask : Recommended for use by the public in non-crowded public places. 2. surgical mask The protective effect is better than that of disposable medical masks. It is recommended that suspected cases, public transport drivers, taxi drivers, sanitation workers and service personnel in public places wear them on duty. 3. Protective mask for particles of KN95/N95 and above: The protective effect is better than that of surgical mask and disposable medical masks. It is recommended for on-site investigation, sampling and testing personnel. The public can also wear it in highly crowded places or closed public places. 4. Medical protective mask It is recommended to be worn by medical staff in fever clinics and isolation wards and during the transfer of confirmed patients. To sum up, there is no need for ordinary people to wear N95, and medical general surgical masks are OK. (II) Replacement frequency: In fact, KN95 Face Mask ,CE Certificate KN95 Mask, on the issue of replacement frequency, at present, there is no clear conclusion on the best wearing time of N95 mask abroad, including WHO, and there is no relevant regulation on the use time of masks in China. Some researchers have done relevant research on the protective efficiency and wearing time of N95 medical protective mask. The results show that the filtering efficiency remains above 95% N95 mask wearing for 2 days, and the respiratory resistance changes little; the filtering efficiency decreases to 94.7% after wearing for 3 days.
(3) However, when the following situations occur, the mask should be replaced in time: 1. When the respiratory impedance increases significantly ； 2. When the mask is broken or damaged ； 3. When the mask and the face can not fit tightly ； 4. The mask is contaminated (In case of blood stains or droplets and other foreign bodies); 5. Used in individual ward or patient contact (Because the mask has been contaminated); 6. If it is a mask containing activated carbon ? When there is a peculiar smell inside the mask. (4) Principles for handling masks after use: 1. Masks worn by healthy people ? There is no risk of transmission of the novel coronavirus, and masks are generally replaced when they are deformed, wet or soiled, resulting in reduced protective performance. Masks used by healthy people can be treated according to the requirements of domestic waste classification. 2. Masks worn by suspected or confirmed patients ? It shall not be discarded at will and shall be regarded as medical waste, which shall be disposed of in strict accordance with the relevant procedures of medical waste and shall not enter the circulation market. (5) Standards and precautions for children to wear masks: 1. It is recommended that children choose to meet the national standards GB262606 2006KN95, and products labeled with particulate matter protective masks for children or adolescents. Children should pay attention to the following items when using masks: 2. Children before wearing ? With the help of parents, carefully read and correctly understand the instructions to master the correct use of respiratory protective equipment; 3. Parents should always pay attention to the wearing of children's masks. If children feel uncomfortable in the process of wearing masks, they should adjust or stop using them in time. 4. Because children's faces are small. ? It cannot be fully fitted with the edge of the adult mask. It is not recommended for children to wear adult masks with fitting requirements. Source: National Health Commission official website (6) In addition, several points should be paid attention to when wearing masks: 1. Wash hands before wearing a mask ? Or avoid touching the inner side of the mask to reduce the possibility of contamination of the mask. 2. Distinguish the inside and outside of the mask Up and down, the light-colored side is the inside, which should be close to the mouth and nose, and the dark-colored side is outward; the end of the metal strip is the top of the mask. 3. Never squeeze the mask with your hands. Including N95 mask, can only isolate the virus on the surface of the mask, if you squeeze the mask with your hand, so that the virus with droplets through the mask, there is still a chance of infection. 4. Be sure to make the mask fit the face as well as possibly &290; The simple test method is: After putting on the mask, exhale hard, and the air can not leak out from the edge of the mask. The last key point is that the posture is very important, otherwise it is useless to wear it! Xiaozhen appeals to everyone that it is now a period of concentrated outbreak of the virus, do not go out unless absolutely necessary,Medical Disposable Coverall, and you must wear a mask when you go out! Long press the identification QR code to follow us More exciting content in the treasure of technology ~ The above pictures are from the Internet. Contact us to delete them. The content of this article is for reference only, not as a medical basis to return to Sohu, see more Responsible Editor:. zjyuan-group.com