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Introduction of N95 Mask

May. 06, 2020

Introduction of N95 mask

The N95 mask is one of 9 types of particulate protection masks certified by NIOSH. "N" means not resistant to oil. "95" means that when exposed to a specified number of special test particles, the particle concentration in the mask is more than 95% lower than the particle concentration outside the mask. The 95% value is not the average value, but the minimum value. N95 is not a specific product name, as long as it meets the N95 standard, and products that pass the NIOSH review can be called "N95 masks." The protection grade of N95 means that under the test conditions specified by the NIOSH standard, the filtering efficiency of the mask filter material to non-oily particulate matter (such as dust, acid mist, paint mist, microorganisms, etc.) reaches 95%.



The filtration efficiency of the N95 mask for particles with an aerodynamic diameter of 0.075µm ± 0.02µm reaches more than 95%. The aerodynamic diameter of airborne bacteria and fungal spores mainly varies between 0.7-10µm, which is also within the protection range of N95 masks. Therefore, the N95 mask can be used for the respiratory protection of certain particulate matter, such as the dust generated by the processes of grinding, cleaning and processing minerals, flour and certain other materials. It is also suitable for the liquid or non-oily generated by spraying. Particulate matter of harmful volatile gas. Can effectively filter and purify the inhaled abnormal odors (except toxic gases), help reduce the exposure level of certain inhalable microbial particulates (such as mold, anthrax, tuberculosis, etc.), but it cannot eliminate contact infection, illness or death risks of.


The US Department of Labor has recommended that medical personnel use N95 masks to prevent microbial airborne diseases such as influenza and tuberculosis.

NIOSH certified other anti-particulate mask levels also include: N95, N99, N100, R95, R99, R100, P95, P99, P100, a total of 9 kinds. These protection levels can cover the protection range of N95.

"N" means not resistant to oil, suitable for non-oily particulate matter.

"R" means resistant to oil, suitable for oily or non-oily particulate matter. If used for the protection of oily particulate matter, the use time should not exceed 8 hours.

"P" stands for oil proof, suitable for oily or non-oily particulate matter. If used for oily particulate matter, the usage time should follow the manufacturer's recommendations.

"95", "99" and "100" refer to the filtration efficiency level when tested with 0.3 micron particles. "95" means that the filtration efficiency is above 95%, "99" means that the filtration efficiency is above 99%, and "100" means that the filtration efficiency is above 99.7%.


In addition to the filtration efficiency of the mask, the tightness of the mask and face is one of the important factors that determine the effectiveness of the mask. Different types of masks have a big difference with the human face. Therefore, before using the mask, the suitability of the mask should be checked first. After the wearer's face tightness test, ensure that the air can enter and exit through the mask when it is close to the edge of the face.


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