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How long can you use a kn95 mask

Time: Author: Views:16120 From: Jingde

How long can KN95 masks be used?

In theory, KN95 masks need to be replaced every 4-6 hours. However, considering that the resources of masks are relatively tight, if you do not go to places where the epidemic is more serious, do not contact suspected or confirmed infections, and the mask is not damaged or infected, the mask can be used multiple times (it is recommended not to exceed 5 times, and the duration of use) Not more than 3 days). Like other masks, such as medical surgical masks or medical care masks, theoretically, they should be replaced every 4-6 hours. However, when the mask is not enough, as long as the mask is not damaged or contaminated, it can be used multiple times.

Are KN95 masks disposable?

If it meets the standard, it can be used repeatedly, but the mask should be replaced if the following situations occur:


  1. When the respiratory impedance increases significantly;

  2. When the mask is broken or damaged;

  3. When the mask and face cannot be closely attached;

  4. The mask is contaminated (if it is stained with foreign objects such as blood stains or droplets);

  5. It has been used in individual wards or in contact with patients (because the mask has been contaminated).


The WHO has not made a clear conclusion on the best time to wear masks, and China has not yet made relevant regulations on the use time of masks. Some researchers have done relevant research on the protection efficiency and wearing time of medical protective masks. The results show that the filtration efficiency of masks remains above 95% after wearing the mask for 2 days, and the respiratory resistance does not change much; the filtration efficiency is reduced to 94.7% after wearing the mask for 3 days.

The advice given by experts is that if there is no sufficient supply of masks, as long as the masks are not obviously soiled or damaged (such as creases or tears), they can be considered for reuse.

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Mask disinfection method is not advisable

Recently, some methods to disinfect masks have been circulating on the Internet, such as heating masks with microwave ovens, heating masks with electric hair dryers, and disinfecting masks with 75% alcohol. These methods are not advisable.


Use a microwave oven to heat the mask. Under the action of high temperature, although the bacteria and viruses on the surface of the mask can be killed, the internal structure of the mask will also be destroyed. As a result, the mask will not have a protective effect and cannot Continue to use it again. And the microwave oven will be contaminated and can no longer be used.


The same goes for heating the mask with a hair dryer. The structure of the mask is easily damaged under the action of high temperature. If there is a virus on the surface of the mask, blow the hair dryer, the bacteria and virus on the surface of the mask will be blown to your face or other places. This will not only increase your chance of infection, but also pollute the environment.


75% alcohol can kill the virus, but it is not advisable to apply alcohol on a mask to kill the virus. Alcohol is very easy to evaporate, and it will not last long after it is applied to the mask, and it will not play the role of anti-virus. Applying alcohol to the outer layer of the mask can easily damage the waterproof structure of the outer layer of the mask and shorten the service life of the mask.


In the current epidemic situation, Xiaoxiaokou has become the most important protective equipment for protecting one's own safety. Faced with the problem of insufficient masks, the best way is to save in real life, go to less crowded places, wear masks correctly, and extend the service life of masks.

Breathing valve of FFP series mask

EU standard masks are divided into two types with or without exhalation valve. People suffering from chronic respiratory diseases, heart disease or other diseases accompanied by dyspnea may make it more difficult for the wearer to breathe. Therefore, using a mask equipped with an exhalation valve can help them breathe more easily. And helps reduce heat buildup.


The design of the exhalation valve is very delicate, with several layers of flaps. When inhaling, the flap will close tightly to ensure that no particles enter. When you exhale, the flap will open, allowing the hot and humid air to escape. At the same time, there is also a soft flap inside to ensure that no small particles enter.


Some people have a lot of misunderstandings about those with an exhalation valve, thinking that there is no protection for an exhalation valve. A study published in 2009 specifically investigated whether the exhalation valve affects the protection of the wearer. The conclusion is that the presence or absence of an exhalation valve does not affect the respiratory protection of the wearer. Simply put, an exhalation valve can protect the wearer, but not the people around.


If you are a virus carrier, please choose one without an exhalation valve and do not spread the virus. If you want to maintain a sterile environment, you cannot use an exhalation valve, because the wearer may exhale bacteria or viruses.


The earband type is convenient to wear and take off and is suitable for short-term outings; the head-wear type: fits tighter and is more comfortable to wear for a long time than the earband type, and can be selected according to actual needs.

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