Medical masks cannot be used casually

Introduction: In recent days, fog and haze once again enveloped the capital. Products that claim “dust-proof and anti-snoring medical masks” are on the e-commerce website. Pedestrians wear a variety of masks in order to erect a flood prevention screen. How exactly can a mask work?

Medical protective masks have the highest degree of protection

The medical mask includes three kinds of medical masks, medical surgical masks and medical protective masks, of which the medical protective masks have the highest degree of protection. It is made of 3 layers of material, the inner layer is mostly non-woven fabric, the middle layer is ultra-fine polypropylene fiber melt-blown material layer, the outer layer is non-woven fabric or ultra-thin polypropylene melt-blown material; Or harmful dust filtering effect is significant, non-oil particles in the air barrier, filtration efficiency ≧ 95%.

“Even if it is such a mask, it cannot completely filter smog. Because smog contains not only non-oily particulate matter such as dust, acid mist, coal dust, cement dust, and microorganisms, but also oily particulate matter such as soot and oil mist. Asphalt smoke, coke oven smoke, diesel exhaust, etc. Oily particulates, gaseous chemicals, medical masks can not be completely filtered out.” Yue Weihua, director of the material inspection department of the Beijing Medical Device Inspection Institute explained.

Yue Weihua also reminded the public that medical protective masks are usually used in the healthcare environment and are not very suitable for ordinary people to wear in everyday life. For example, N95 masks are usually used for occupational respiratory protection, blocking certain microbial particles (such as viruses, bacteria, mold, anthrax, Mycobacterium tuberculosis, etc.), but due to its thick texture, usually not comfortable to wear.

Medical masks must be tested on the market

"All medical masks are medical devices and must be strictly tested by a nationally recognized professional testing agency before they can be listed. Among them, medical masks have the largest number of detection indicators, the most stringent, and particle filtration efficiency and adhesion are the most important performance indicators. "Yue Weihua said. The National Standard for Medical Protective Mask Technical Requirements has been issued. In addition, in addition to particle filtration efficiency and adhesion detection, various types of medical masks need to pass more than 10 items such as nose clips, masks, and microbiological indicators.

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