Currently, the protective mask is a medical device product that everyone is particularly concerned about. The protective mask can help us resist virus infection, and the KN90 protective mask is a very common dust mask that can prevent the virus.

How often should the KN90 protective mask be replaced?

Currently, the KN90 protective mask is generally disposable and should be replaced after 2-4 hours of wearing. And the timing for immediate replacement should not be fixed according to whether the mask is damp and cold inside. It is recommended to replace this disposable mask regularly, especially after it gets damp and cold, and it is advisable to minimize going out, which is a more reasonable preventive measure.

Can the KN90 protective mask prevent bacteria?

The KN90 protective mask is a technical professional dust mask in accordance with our country’s standards, which can prevent the virus. Its material is non-irritating and non-allergenic to the skin, and the design of wearing it is more inseparable from the face than general protective masks. The KN90 has a filtration efficiency of over 90% for non-oily particles larger than 0.075μm, while the size of the new novel coronavirus at present is between 0.1-0.3μm, and the key to the spread of the virus is through droplet transmission, with the size of droplet transmission between 1-10μm. Therefore, the KN90 protective mask has a very good virus protection effect, superior to general disposable medical surgical masks and surgical protective masks. It has good breathability and is suitable for staff with high exposure risks, such as medical staff in isolation rooms and those involved in diagnosis, suspected clinical epidemiological research, and others.

Is the KN90 protective mask significantly different from the N95?

1. Let’s talk about the meaning of N first, and the difference between KN and N:

N indicates ‘Not resistant to oil’, which can be used to protect against non-oily suspended particles. KN95 is one of the grades required by the Chinese standard GB2626-2006, and N95 is one of the grades required by the international standard 42 CFR 84. These two grades have basic standards, testing standards, etc., which are basically consistent, and they all meet the standard of filtration efficiency reaching 95%.

2. Let’s talk about the meaning of 95 and 90:

The number 95 means that the filtration efficiency is greater than 95%, indicating that after careful testing, this type of breathing mask can block at least 95% of the smallest (0.3μm level) test particles. The number 90 means that the filtration efficiency is greater than 90%, indicating that after careful testing, this type of breathing mask can block at least 90% of the smallest test particles. KN90 protective masks and KN95 can prevent the spread of droplet infections, but they are not 100% protective. KN95 has a better filtration than KN90, and the medical protective level is mandatory higher than KN95. If purchased independently, KN90 is also acceptable.

Note the key points

1. The medical surgical protective mask, the deep brown color should be on the outside.

If the medical surgical protective mask is worn incorrectly, the protective ability will be greatly weakened. The correct operation is to wear the darker color on the outside, the lighter color on the inside, and the metal strip on the nose.

2. There is a breathing valve on the protective mask, so there is no need to worry.

The breathing valve’s spiral is unidirectional outward, which does not affect the user’s safety protection effect. However, for those who already have symptoms, it is recommended not to use dust masks with breathing valves, as they cannot prevent the overflow of virus droplet transmission.

3. KN90 protective masks and medical care protective masks are secondary options.

For general transportation, non-deep contact, both of these types of protective masks have a certain level of ability to prevent droplet transmission and reduce the risk.

4. If there is none of the above, wearing a regular mask is better than not wearing one.

5. Replace the protective mask regularly.

If the waiting time at the airport or subway station is long, be sure to prepare multiple protective masks in advance, preferably changing them every 2 to 4 hours. Once the disposable mask is removed, it should not be reused multiple times.

6. Do not believe the rumor that ‘smoking can protect against viruses’.

Wearing a mask while smoking is not possible, as the arms may touch the mouth and nose, increasing the risk of virus infection. The harmful substances in cigarettes will also continue to damage lung function, and the second-hand smoke exhaled will also harm the physical and mental health of nearby people.