Safety standards for N95 masks

N95 mask is one of the nine standards formulated by NIOSH in 1995. "N" means "not resistant to oil". "95" means that when exposed to a specified number of special test particles, the particle concentration inside the mask is 95% lower than the particle concentration outside the mask. Among them, the value of 95% is not the average value, but the minimum value.

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 For particulate matter, if used for the protection of oily particulate matter, the use time should not exceed 8 hours; "P" means that it is suitable for oily or non-oily particulate matter. If it is used for oily particulate matter, the use time should follow the manufacturer's recommendation. And "99" and "100" respectively refer to the filtration efficiency level.

According to the oil resistance, it is classified into "N", "R", and "P". According to the capture rate, it is classified into "95", "99" and "100". "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 above 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 an N95 certification number.