When viruses are rampant and a single droplet can cause the virus to spread faster and infect more people, it is time to put away your blind confidence and urge you to wear a good mask! The KN95 mask supplier will explain the use, usage and life span of masks. It is also important to stress that you should not discard your masks after use.
Why should you wear a mask?
The coronavirus is transmitted from person to person, usually when someone comes into contact with the secretions of an infected person. The infectivity of the virus directly influences the route of transmission. The route of transmission of the currently prevalent new coronavirus is not known, but past experience suggests that contact with bodily fluids splashed from an infected person's cough or sneeze, or shaking hands with an infected person may lead to infection. If you touch something that an infected person has touched with your hand and then touch your own mouth, nose or eyes, you can also pass on the virus.
Normally, a person's lungs hold about a litre of fluid, and each time they sneeze, the lungs eject this fluid in a mist like a squeezed mineral water bottle. When they reach the outside of the body, they split into more than 40,000 small droplets, each of which contains a medium to a large number of viruses and bacteria. Due to the enormous thrust inside the body, these liquids can travel at speeds of up to 35 metres per second and can spread over distances of 3 to 8 metres.
Is there a difference between KN95 and N95?
N95 masks are actually respirators, which are a type of respiratory protection device designed to fit more closely to the face than ordinary masks and are very effective at filtering out airborne particles. The N stands for Not resistant to oil, which can be used to protect against non-oil suspended particles and the 95 means that the filtering efficiency is greater than or equal to 95%, indicating that after careful testing the respirator can block at least 95% of the very small (0.3-micron class) particles tested.
In terms of design, when ranked in order of priority for the wearer's own protection (from highest to lowest): N95 mask > surgical mask > normal medical mask > normal cotton mask.
If worn correctly, the filtration capacity of an N95 mask is superior to that of a regular mask and a medical mask. However, even when worn in full compliance, it does not eliminate 100% of the risk of contracting disease or death.
KN95 is one of the levels specified in the Chinese standard GB2626-2006.
N95 is one of the classes specified in the American standard 42 CFR 84.
The technical requirements and testing methods for these two levels are basically the same, both of which correspond to a filtration efficiency of 95% under the standard.
How long can a KN95 mask be used?
At present, there has been no clear conclusion from abroad, including the WHO, on the optimal wearing time for N95 masks, and China has not yet made relevant regulations on the use time of masks.
Some researchers have done research on the protection efficiency and wearing time of KN95 masks, and the results show that the filtration efficiency of N95 masks remains above 95% with little change in breathing resistance when worn for 2 days; the filtration efficiency decreases to 94.7% when worn for 3 days.
The advice given by the CDC is to consider re-use in the absence of an adequate supply of masks, as long as the equipment is not visibly soiled or damaged (e.g. creased or torn).
Situations in which masks should be replaced promptly
1. When there is a significant increase in breathing resistance.
2. When the mask is torn or damaged.
3. When the mask does not fit snugly on the face.
4. When the mask is contaminated (e.g. with foreign matter such as blood or droplets).
5. When the mask has been used on an individual ward or patient contact (because the mask has been contaminated).