1. N-type respirator is one of nine NIOSH (National Institute of occupational safety and health) certified particle respirators, which means that it is not suitable for oily particles.

2. "N" means not suitable for oily particles.

Safety standards

Other NIOSH certified particle mask grades also include: N95, n99, N100, R95, R99, R100, p95, p99, P100, all of which can cover the protection range of N95, where "R" refers to oil-based or non oil-based particles, if used for the protection of oil-based particles, the use time is not more than 8 hours; "P" refers to oil-based or non oil-based particles, if used for the protection of oil-based particles, the use time is not more than 8 hours; "P" refers to oil-based or non oil-based particles For oily particles, the service life shall be in accordance with the manufacturer's recommendations. "99" and "100" refer to the filtration efficiency level respectively.

According to the oil resistance, it is divided into "n", "R", "P", and according to the capture rate, it is divided into "95", "99" and "100". "R" means "resistant to oil", "P" means "oil proof", 99 "in the capture rate means above 99%, and" 100 "means above 99.7%.

In addition, when N100, P100 and R100 are tested with 0.3 micron particles, the barrier efficiency must be over 99.7%, n99, p99 and R99 all have a filtration rate of over 99%, while N95, p95 and R95 all have a filtration rate of over 95%.

Therefore, N95 mask is tested with 0.3 μ M sodium chloride particles, with a barrier rate of more than 95%. When the user's face density is tested, air can enter and exit through the mask when it is close to the face edge. Only those who meet this test can issue N95 certification number.

There is a certain gap between the detection methods of domestic and foreign respirators. Generally speaking, the respirators certified by the existing domestic standards can not reach the N95 level standard.

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