Do you know what are the national standards for N95 masks? Since 2013, the new term smog has come into people’s sight. In response to smog, anti-smog masks are indispensable for individuals. There are many kinds of smog masks, which one is better for dust and smog masks? Professionals from all sides, including doctors, are suggesting that the public should wear N95-certified masks in smog days. Are N95 masks really reliable? N95 copper mask
national standard 1. N95 mask is one of the nine standards formulated by NIOSH in 1995. N represents Not resistaNt to oil. 95 means that the concentration of particles inside the mask is 95% lower than that outside the copper mask when exposed to a specified number of special test particles. Among them, the value of 95% is not an average value, but a minimum value, so the average value of actual products is mostly set above 99%. N95 mask national standard 2. Other anti-particulate mask levels certified by NIOSH also include: N99, N100, R95, R99, R100, P95, P99, P100, these protection levels can cover the protection range of N95, where R refers to, suitable For oily or non-oily particles, if used for the protection of oily particles, the use time should not exceed 8 hours; P means that it is suitable for oily or non-oily particles. If used for oily particles, the use time should follow the manufacturer's recommendations. And 99 and 100 respectively refer to the filtration efficiency level. N95 mask national standard 3. Divided into N, R, P according to oil resistance, and divided into 95, 99 and 100 according to capture rate. R stands for resistance to oil, P stands for oil proof, 99 in the capture rate means more than 99%, and 100 means more than 99.7%. National standard for N95 masks 4. In addition, when the three types of masks N100, P100, and R100 are tested with 0.3 micron particles, the barrier efficiency must reach 99.7% or more. N99, P99, and R99 all have a filtration rate of more than 99%, while N95, P95 , R95 has a filtration rate above 95%. Therefore, the N95 mask is tested with 0.3 micron sodium chloride particles, and the barrier rate must be more than 95%. When the wearer’s face is tested for tightness, it is ensured that air can enter and exit through the mask when it is close to the edge of the face. . Only those who meet this test will be issued N95 certification numbers. At present, there are still some dust masks in the market that implement American standards starting with N95, or European standards starting with FFP, but these standards do not apply to civilian masks. The American standard divides masks into three categories: R\P\N. The number after the letter indicates the filtration rate of 0.3 micron particles (PM0.3), such as 95, which is 95% filtration rate. Class N is only used to protect non-oily particles, such as N95. Class R protects both oily and non-oily particles within 8 hours, such as R95. Type P is used for a long time to protect both oily and non-oily particles, such as P95. Under normal circumstances, most of the components of haze are non-oily particles, so we usually choose N series dust masks when preventing haze. The filtering effect of Jinjiang masks without breathing valves is the best, with a PM2.5 filtering rate of 96.5%; followed by black shield masks with breathing valves. Disposable medical care masks have a filtering effect of 47.1%; the cotton masks most commonly used by the people have a filtering effect of only 17.3%. At present, there are many problems in my country's PM2.5 protective mask market: on the one hand, copycat PM2.5 protective masks flood the market; on the other hand, industrial dust masks are misused in large numbers, posing huge health risks. According to the relevant testing of 'PM2.5 Protective Masks' group standard products, it is found that the current pass rate of anti-smog masks in the market is only 20%. 395
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