跳至主要内容

Introduction of N95 Mask

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.

评论

发表评论

此博客中的热门博文

Tyvek Protective Coveralls

  Tyvek   Protective Coveralls  (Tyvek) is a wide range of   protective gown   manufactured by Tyvek (Tyvek) for use by emergency responders to industrial workers. Tyvek  protective clothing  offers the industry's proven most scientific solutions, including the reliable brand 3360Tyvek for dust protection, Tychem for liquid and gas hazardous chemical protection, NOMEX for heat and flame protection, and KEVLAR for cutting and wear protection. TYVEK protective suit is made of traditional TYVEK polymer coating. It has the strength/weight ratio and softness of TYVEK protective suit, which can completely protect fine and harmful dust, concentrated inorganic acid and alkali and water and salt solution. Protects up to 2 bar pressure from spatter. The Tevetron protective suit (Tevetron) has been proven to protect fluids, blood and pathogens in blood through osmosis tests with blood and virus substitutes. Function description of Trevek protective suit: TYVEK pr...
发表评论
阅读全文

Biodegradability, reusability and safety of protective clothing

  Microplastic pollution, known as "pm2.5 in water", has become a direct source of pollution in the ocean, soil and drinking water, affecting human health. Medical   protective coveralls   is almost made of different polymer materials. The development of a new material can replace the existing material to form a new series of products. As most of the existing   protective suits  are designed to be disposable, they are used heavily during the pandemic. Used medical   protective clothing   should be disposed of centrally to prevent secondary transmission of the virus. Therefore, protective clothing materials must be developed to be repeatable and degradable. Due to the particularity of application scenarios, most medical  protective gown  is disposable. Therefore, environment-friendly materials should be considered in the development of medical  protective gown , and must be considered before material selection and protective clothes desig...
发表评论
阅读全文

Production process of medical protective clothing

  Generally speaking, the production of medical   protective coveralls   needs to go through the steps of raw material preparation, cutting, stitching, tightening, adhesive and pressing, finished products, sterilization and disinfection, warehousing and so on. Among them, sterilization and disinfection takes the longest time. Ethylene oxide is mostly used for sterilization and disinfection of materials, which requires 7-14 days of analysis, seriously affecting the production efficiency of medical   protective gown , and a more efficient sterilization method is urgently needed. Irradiation sterilization can be sterilized without disassembly and assembly, which is efficient and prevents secondary pollution. In 2011, Japan has listed the operation specifications of irradiation sterilization in the sterilization standard for protective clothing, which will reduce the sterilization time to less than 1 d. In order to address the shortage of medical protective clothes durin...
发表评论
阅读全文