1. KN non-woven mask filtration efficiency: For filtrat […]
1. KN non-woven mask filtration efficiency:
For filtration efficiency, GB 2626-2006 stipulates that KN non-woven masks only measure non-oily particles. The filtration efficiency is divided into three grades, KN90 ≥90%, KN95 ≥95%, KN100 ≥99.97%; KP type masks only measure oily particles , The filtration efficiency is divided into three grades, KP90 ≥90%, KP95 ≥95%, KP100 ≥99.97%;
EN 149:2001+A1:2009 stipulates that all masks are tested for non-oily and oily particles. The filtration efficiency is divided into three levels, FFP1 ≥80%, FFP2 ≥94%, FFP3≥99%. In general, FFP2 and FFP3 The required value of filtration efficiency is similar to that of our country.
2. Leakage rate:
Regarding the leakage rate, GB 2626-2006 measures the leakage rate in two ways: one is the total leakage rate of at least 46 out of 50 actions, and the other is the total leakage rate of at least 8 out of 10 people. KN90/KP90 requires two values ≤25% and ≤22% respectively; KN95/KP95 requires two values ≤11% and ≤8% respectively; KN99/KP99 requires two values ≤5% and ≤2% respectively.
EN 149:2001+A1:2009 measures the leakage rate in the same way: one is the total leakage rate of at least 46 of 50 actions, and the other is the total leakage rate of at least 8 people out of 10 people. FFP1 requires two values to be ≤25% and ≤22% respectively; FFP2 requires two values to be ≤11% and ≤8% respectively; FFP3 requires two values to be ≤5% and ≤2% respectively.
If you are wearing an ordinary non-woven mask, then you can wear 20 masks to match the protective ability of a KN95 mask. KN95 uses a scientific method to filter out all particles above 0.3 microns in the air, including viruses, bacteria, and haze. 0.3 microns is a very small unit.
Inside the KN95 mask, there is a layer called meltblown non-woven fabric, which contains some ultra-fine electrostatic fibers. After treatment, it has electrostatic adsorption function. Everyone can think about it in winter, for example, when there is static electricity on your clothes, some hair and small hair will be adsorbed. This mask is also based on the same principle. After treatment, it can adsorb some ultra-small viruses in the air. Bacteria and particles, so its protective function is so powerful.
During the epidemic, wearing a mask can effectively block the tiny particles and droplets in the air and prevent the virus from being infected by breathing. It is necessary to take safety measures to go out during special times. It should be noted that when the mask is dirty, deformed, damaged, or smells, it should be replaced in time. Masks worn by healthy people can be disposed of in accordance with the requirements of household garbage classification. Masks used by suspected patients, confirmed patients, and asymptomatic infected persons, or masks worn during close contact with them, should not be thrown away at will. They should be treated as medical waste and handled strictly in accordance with the relevant procedures of medical waste.