What are the differences between Surgical face mask, KN95 face mask, and N95 face mask? Due to the occurrence of COVID-19, this issue has become a very concern for everyone.

1. What is the difference between the KN95 face mask, and the N95 face mask?

KN95 face mask: It is stipulated in Chinese norms and standards. According to Chinese norms and standards, masks can be divided into two categories: KN and KP. KN is suitable for filtering non-oily particles, and KP is suitable for filtering oily particles. The following figure is the percentage of filtration efficiency. KN95 face mask stipulates that the filtration efficiency for non-oily particles above 0.075 microns is greater than 95%.

N95 face mask: American NIOSH dust mask standard, non-oily particulate filtering efficiency ≥95%.

KN95 face mask and N95 face mask just have different names, and the masks produced according to these two standards have the same protection level. You can rest assured to buy any KN95 face mask or N95 face mask standard mask, there is no difference in protection effect.

2. Precautions for wearing the KN95 face mask and N95 face mask

1) Before wearing the KN95 face mask and N95 face mask, or during wearing a KN95 face mask and N95 face mask, avoid touching the inner side of the KN95 face mask and N95 face mask to reduce the contamination of KN95 face mask and N95 face mask may.

2) Distinguish the inside, outside, top, and bottom of the KN95 face mask and N95 face mask; the light color of the KN95 face mask and N95 face mask is inside; one end of metal strip/sponge strip is above KN95 face mask and N95 face mask.

3) Do not squeeze the KN95 face mask and an N95 face mask by hand. Including the KN95 face mask, you can only isolate the virus on the surface of the face mask. If you squeeze the face mask by hand, the virus will soak the face with the droplets. mask, there is still a chance of infection.

4) Make sure that the KN95 face mask and N95 face mask have good adhesion with the face. The simple test method is: after putting on the KN95 face mask and N95 face mask, exhale hard, and the air cannot leak out from the edges of the KN95 face mask and N95 face mask.

KN95 face mask and N95 face mask are not omnipotent, but wearing a KN95 face mask and N95 face mask correctly, often washing hands and disinfecting, can reduce the chance of infection!

No matter what kind of face mask, try not to bring it back, and do not reuse the face mask at the same time. It is also necessary to understand the correct way to wear the face mask. Only wear the face mask correctly to protect it!

3. Do KN95 face mask and N95 face mask need breathing valves?

KN95 face mask and N95 face mask are divided into two types with or without an exhalation valve. Whether there is an exhalation valve does not affect the respiratory protection of the wearer.

KN95 face mask and N95 face mask respirator may make the breathing of the wearer more difficult for people with chronic respiratory disease, heart disease or other diseases accompanied by symptoms of dyspnea, so use KN95 face mask equipped with an exhalation valve And N95 face mask can make them breathe easier and help reduce heat accumulation.

Simply put, the KN95 face mask and N95 face mask with exhalation valve can protect the wearer, but not the people around them.

If you are a virus carrier, please choose the KN95 face mask and N95 face mask without exhalation valve, do not spread the virus.

If you want to maintain a sterile environment, you can not use a KN95 face mask and N95 face mask with an exhalation valve, because the wearer may exhale bacteria or viruses.

4. How long can KN95 face mask and N95 face mask be used?

At present, the WHO has not made a clear conclusion about the best wearing time of the KN95 face mask and N95 face mask.

Some researchers have done research on the protection efficiency and wearing time of KN95 face mask and N95 face mask: the wearing efficiency of KN95 face mask and N95 face mask is 2 days, the filtration efficiency remains above 95%, and the respiratory resistance does not change much; wearing it for 3 days The filtration efficiency is reduced to 94.7%.

The recommendation given by the US CDC is that in the absence of a sufficient supply of face masks, as long as the device is not obviously stained or damaged (such as creases or tears), it can be considered for reuse.

Special circumstances require timely replacement:

1) Breathing is difficult.
2) The face mask is damaged.
3) The face mask is contaminated.
4) There is odor in the face mask.
5) The face mask can no longer fit the face.

tips: Under the COVID-19, it is necessary to actively cooperate with wearing the KN95 face mask and N95 face mask.