KN95 masks work best, more layers are more effective, and you need to change one every few hours. How can we protect ourselves in the face of the overwhelming clutter of information? The next mask supplier will tell you how to choose a mask.

The letters represent different national standards. The N series of masks is the American standard, the KN series is the Chinese standard, the FFP series is the European standard and the KF series is the Korean standard. The number at the end refers to the protection capacity, the higher the protection level. 95 refers to the ability to filter out more than 95% of non-oil particles, 90 series does not have the same protection level as 95, but can also resist more than 90% of particles. 2 in the FFP series basically corresponds to 95, while 3 indicates a higher filtration efficiency of 99%. 

If the filtering capacity is ranked, it can be simply understood as follows.

FFP3 > FFP2 = N95 = KN95 = KF94 > KN90.

What is the difference between medical and non-medical masks?

Recently, people often hear about the concept of "medical masks", so what is the difference between medical and non-medical masks? Dong Peng said that N95, KN95 and other masks include both medical and non-medical types. Among them, masks with the "medical" logo can be used for front-line protection during the epidemic fight by medical personnel, while masks without the "medical" logo are not recommended for medical personnel, but can be used by ordinary people.

KN95 Mask

The main difference between the two is that the outer surface of medical masks is treated with a hydrophobic layer, meaning that blood, sweat, etc. cannot penetrate. In the absence of this waterproof layer, frontline healthcare workers run a double risk. Firstly, the mask can easily get wet, and as the water molecules become liquid, the gravitational force between the molecules increases, which is equivalent to breaking through the barrier of the mask, making it easy for viruses to enter. Secondly, health care workers are easily exposed to the patient's blood and body fluids in a high probability.

To prevent pneumonia, it is important to remember how to wear the mask and its principles

A good mask is useless even if it is worn incorrectly. Therefore, wearing it scientifically and reasonably and using it in a regulated manner can help us to protect it effectively. Recently, the Bureau of Disease Prevention and Control of the National Health and Wellness Commission issued the "Guidelines on the use of pneumonia masks for the prevention of novel coronavirus infections". Dong Peng, in conjunction with his clinical practice, has summarised some guidelines for your reference as well.


1. masks are not required in open and ventilated places in non-epidemic areas and are required when entering crowded or confined public places.

2. Wearing a single-use medical mask is recommended in open and ventilated places in areas with a high incidence of the epidemic; wearing a medical-surgical mask or a particulate protection mask when entering crowded or confined public places.

3. Particulate masks without exhalation valves or medical masks should be worn when visiting hospitals with suspected symptoms.

4. Cotton gauze masks, sponge masks and activated charcoal masks offer no protection against viral infections.

5. Masks worn by healthy people should generally be replaced when they are deformed, wet or soiled, resulting in reduced protection, and disposed of in accordance with the requirements for separation of household waste.

6. The masks are worn by suspected or confirmed patients should not be discarded at will, but should be treated as medical waste and disposed of in strict accordance with the relevant procedures for medical waste, and should not enter the circulation market.

7. Keep a distance of more than 1 metre from others in public; cover your mouth and nose with tissues and sleeves when coughing or sneezing.