Element Encyclopedia introduces you the safety standards of n95 masks and whether n95 masks have an expiry date. Nowadays, it is very common for people to use protective masks. Protective masks can be used to block gases, viruses and dust in the air. Among all the protective masks, n95 masks are the most basic masks. What is its protection standard? ? N95 copper mask
safety standard N95 copper mask is one of the nine standards formulated by NIOSH in 1995. N means not resistant to oil. 95 means that the concentration of particles inside the mask is 95% lower than that outside the mask when exposed to a specified number of special test particles. Among them, the value of 95% is not the average, but the minimum. Other levels of NIOSH certified anti-particulate masks 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 it is 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 it is used for oily particles, the use time should follow the manufacturer's recommendations. And 99 and 100 respectively refer to the filtration efficiency level. is divided into N, R, P according to oil resistance, and 95, 99 and 100 according to the capture rate. R means resistant to oil, P means oil proof, 99 in the capture rate means more than 99%, and 100 means more than 99.7%. In addition, when the N100, P100, and R100 masks are tested with 0.3 micron particles, the barrier efficiency must reach 99.7% or more. N99, P99, and R99 are all filtration rates above 99%, and N95, P95, and R95 are all filtration rates. 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. Generally speaking, protective masks that have passed the existing domestic standard certification are still unable to meet the N95 level standard. Does n95 mask have an expiration date? There is no clear warranty date for N95 masks. It will not affect the filtering effect of the mask when used for a long time, and there is no need to worry about the loss of filtering efficiency and cause failure. However, when the resistance increases to an unacceptable level, the mask needs to be replaced. If it is damaged, unhealthy, loose headband, or deformed mask, please replace it in time.
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