What is a N95 mask?

 The N95 mask is one of nine particulate protective masks certified by NIOSH (National Institute of Occupational Safety and Health). "N" means not resistant to oil. "95" means exposed to a specified number of special test particles. The particle concentration in the mask is more than 95% lower than the particle concentration outside the mask. The 95% value is not the average value, but the minimum value. The protection level is N95, which means that under the detection conditions specified by the NIOSH standard, the filter efficiency of the mask filter material for non-oily particulate matter (such as dust, acid mist, paint mist, microorganisms, etc.) reaches 95%. N95 is not a specific product name. As long as it meets the N95 standard and passes the NIOSH review, it can be called "N95 mask". The N90 type mask has a filtration efficiency of 90%.


N95 mask use range:

 Protection of medical personnel and related staff against airborne respiratory infectious diseases.

Basic protection for medical or related personnel, and protection against the spread of blood, body fluids and splashes during invasive procedures.

Disposable sanitary care in ordinary environment, or the blocking or protection of particles other than pathogenic microorganisms such as pollen.


 NIOSH certified other anti-particulate mask levels also include: N95, N99, N100, R95, R99, R100, P95, P99, P100, a total of 9 types. These protection levels can cover the protection range of N95.

“N” means not resistant to oil, suitable for non-oily particulate matter, and there is no limitation on the use time.

"R" means resistant to oil, suitable for oily or non-oily particles. If used for the protection of oily particles, the use time should not exceed 8 hours.

 "P" means oil proof, suitable for oily or non-oily particles. If used for oily particles, the usage time should follow the manufacturer's recommendations.

 "95", "99" and "100" refer to the level of filtration efficiency when tested with 0.3 micron particles. "95" indicates that the filtration efficiency is above 95%, "99" indicates that the filtration efficiency is above 99%, and "100" indicates that the filtration efficiency is above 99.7%.


 What is KN95 mask?

 KN95 is the classification of anti-particulate masks by the Chinese national standard GB2626-2006, which refers to masks with a filtration efficiency of greater than 95% for non-oily particulates above 0.075 microns

 According to the performance, it is divided into two types: KN and KP. KN is only suitable for filtering non-oily particles, and KP is suitable for filtering oily particles.

 KN series:

 KN100: For non-oily particles above 0.075 microns, the filtration efficiency is greater than 99.97%

 KN95: For non-oily particulate matter above 0.075 microns, the filtration efficiency is greater than 95%

 KN90: For non-oily particles above 0.075 microns, the filtration efficiency is greater than 90%


KP series:

 KP100: For oily particles above 0.185 microns, the filtration efficiency is greater than 99.97%

 KP95: For oily particles above 0.185 microns, the filtration efficiency is greater than 95%

 KP90: For oily particles above 0.185 microns, the filtration efficiency is greater than 90%

 KN90 mask use range:

 Mainly applicable to industries with oily and non-oily pollutants such as dust, smoke, fog and other particles above 0.185 microns produced by non-ferrous metal processing, metallurgy, iron and steel, coking, gas, organic chemicals, food processing, construction, decoration, petrochemical and asphalt, etc. .

 So: The technical requirements and test methods of the two levels of KN95 masks and N95 masks are basically the same, but they belong to different national standards.


What is a 3M mask?

 "3M masks" refers to all products manufactured by 3M companies that can be called masks. They can be divided into three categories: medical masks, particulate protective masks, and comfortable warm masks. Each type of mask has a different protective focus.

 3M medical protective masks are made in China and imported. They have the protective performance of medical surgical masks and particulate protective masks. They are used exclusively in hospitals and can filter particulates in the air and block droplets, blood, body fluids and secretions. .

 3M dust masks are commonly known as 3M dust masks. The use of protective masks at work to protect the health of workers belongs to the scope of occupational health. Anti-particulate masks are used to reduce all kinds of harmful particles suspended in the air through the respiratory tract (from coarse sand, dust, to fine dust, smoke, smoke and dust produced in various production processes, air pollutants PM2.5, including fine particles) Pathogens). 3M masks (high-efficiency protection against harmful particles) 90, 93, 95, 99, 8210 and 8110s all meet the requirements of China's PM2.5 protection! But if you want to exhale smoothly and meet US or EU standards, please choose 8210V, 9322 , 9332! If you want to meet the WHO's requirements for influenza protection, choose 9010, 8210, 8110s, 8210v, 9322, 9332! (Suitable for young children).


What is a medical surgical mask?

Medical surgical masks are masks worn by medical staff at work. It is mainly used in medical clinics, laboratories, operating rooms and other high-demand medical environments, with a relatively high safety factor and strong resistance to bacteria and viruses. Medical surgical masks can also be used to prevent the spread of influenza and respiratory diseases. The medical surgical mask has three layers, which are a waterproof layer, a filter layer and a comfort layer from the outside to the inside.

To sum up and compare:

In terms of protective capabilities: N95 masks ≈ KN95 masks> N90 masks>  Medical surgical masks> Ordinary masks

Wearing comfort: ordinary masks ≈ surgical masks> KN95 masks ≈ N95 masks


The outer layer of the mask often accumulates a lot of dirt, bacteria and other dirt in the outside air, and the inner layer blocks the exhaled bacteria and saliva. Therefore, the two sides cannot be used alternately, otherwise the dirt contaminated by the outer layer will directly adhere to When inhaled on the face, it becomes a source of infection. When not wearing the mask, it should be folded into a clean envelope, and the side that is close to the nose and nose should be folded inward. Do not put it in your pocket or hang it around your neck.

If the mask gets wet with exhaled heat or saliva, its barrier effect will be greatly reduced. Therefore, it is best to prepare a few more masks in order to replace them, and they should be changed and washed once a day. Masks should be cleaned and disinfected daily. Both gauze masks and air filter masks can be disinfected by heating. The specific approach is:


  1. Cleaning. Gently rub the gauze mask with warm water and soap. The bowl-shaped mask can be gently cleaned with a soft brush dipped in detergent, and then washed with water. Please be careful not to rub hard, because if the warp and weft gap of the gauze is too large, it will lose the effect of preventing droplets.


  1. Disinfection. Soak the cleaned face mask in a 2% peroxyacetic acid solution for 30 minutes or cook in boiling water for 20 minutes or put it in a steamer for 15 minutes, then dry it for later use. This method is suitable for gauze masks and bowl masks.


  1. Check. Before using it again, you should carefully check whether the masks and masks are still intact. For the gauze masks and masks, you can use the light transmission inspection method. Is the rate consistent? If in doubt, replace it with a new one. In any case, masks and masks are generally updated after 3 to 7 times of cleaning, and masks of particularly good quality can be washed 10 times. Activated carbon adsorption masks should be replaced regularly with activated carbon interlayers. If activated carbon interlayers are not replaceable, they must be replaced after 7 to 14 days. This type of mask cannot be reused after cleaning.