Kn90 and kn95 masks can play a preventive effect, if we have to say the difference, that is, different grades lead to certain price differences. Recently, masks are out of stock. If you don't know which one is better, you can see the difference between kn95 and Kn90 provided by our website.
Kn90 and kn95 which can prevent virus
Can be prevented.
Kn95 is one of the levels specified in the Chinese standard gb2626-2006; N95 is one of the levels specified in the American Standard 42 CFR 84. The technical requirements and test methods of the two levels are basically the same, and the filtration efficiency reaches 95% under the corresponding standards.
If worn correctly, the filtration capacity of N95 is better than that of ordinary masks and medical masks. However, even if the wearer fully meets the requirements, the risk of infection, disease or death cannot be 100% eliminated.
The difference between kn95 and Kn90
1. Different grades. The protection level of Kn90 is lower than that of kn95.
2. The filtration efficiency is different. The Kn90 mask can filter more than 90% of the particulate matter; the kn95 mask can filter more than 95% of the particulate matter.
3. The air permeability is different. The higher the filtration efficiency of the mask, the worse the air permeability. Therefore, Kn90 has better air permeability than kn95.
How long can kn95 mask be used
At present, there is no clear conclusion on the best wearing time of N95 mask in foreign countries, including who, and China has not made relevant regulations on the use time of N95 mask.
However, some researchers have done relevant research on the protection efficiency and wearing time of N95 medical protective mask. The results show that after wearing N95 mask for 2 days, the filtration efficiency still remains above 95%, and the respiratory resistance changes little; the filtration efficiency reduces to 94.7% after wearing N95 medical protective mask for 3 days.
The U.S. CDC recommends that in the absence of adequate supply of masks, the equipment can be considered for reuse as long as it is not visibly soiled or damaged (such as creases or tears).
Can the mask be used after washing
Depending on the situation, according to the different materials of the mask, there are different situations.
If it is a common disposable mask, it has been disinfected by ultraviolet rays, so there is no hygiene problem when it is just taken out for use. However, the disposable mask can not be washed. It has been used once, and the mask has been stained with various bacteria and viruses. Even if it is washed, it can not completely eliminate the bacteria. The material used for the mask is also relatively rough, and it can be cleaned It may be broken. It is recommended not to use it again.
If you buy masks in the store, pure cotton, chemical fiber, these can be cleaned and then used. But inevitably there will be bacteria, it is recommended to soak in boiling water and disinfect with alcohol.