Shanghai Consumer Protection Committee purchased half of the experience of commercially available PM2.5 protective masks worrying

“The only choice for outdoor isolation of PM2.5”, “Antibacterial and anti-mite, a cover of dust,” “The filtration efficiency of PM2.5 airborne particulates and bacteria is >99%”... As the urban air becomes more and more hazy We often see the promotion of various filtering efficiency and protection features in a wide variety of masks. So, can these PM2.5 protective masks really prevent PM2.5? Shanghai Consumer Protection Committee simulated the identity of consumers, purchased 17 samples (including 2 physical store purchases, 15 online store purchases), and entrusted Shanghai Labor Protection Products Quality Supervision and Inspection Station to filter efficiency, (total) Key indicators such as leakage rate, inhalation resistance, and expiratory resistance were tested.

The filtration efficiency is a key indicator of the basic performance of a mask. It refers to the percentage of particulate matter that the mask can filter out under the specified detection conditions. Sampling tests found that the filtration efficiency of 7 samples was greater than 90%, and the filtration effect was better; 8 samples were lower than 50%, and the lowest was only 6.5%, and the filtration effect was poor. According to reports, the filtering efficiency of masks is even higher, but it is not possible to provide effective protection because of poor fit. Therefore, the (total) leakage rate of masks is also a key technical indicator. Sampling inspection found that except for 2 samples that were too small to be tested for this project, the remaining 15 samples were tested and 5 samples (total) had a leakage rate of less than 10%, with good protection performance; 6 samples were greater than 50%. . The inhalation resistance and exhalation resistance of the mask will affect the consumer's experience. Of the 17 samples tested, except for the 2 samples that were too small to be tested for this item, the remaining 15 samples were tested and the inhalation resistance values ​​ranged from 26 to 274 Pa, and the exhalation resistance values ​​were 21 to 119 Pa.

In addition, the product identification can reflect the basic information of the product, help the user to understand the product information, to avoid the wrong choice and use. Should mainly include: product name, trademark or other distinguishable manufacturer's label, type or model (if applicable), implementation of standards, filter element filter grade; certificate, product manual, name, site, production date Wait. Experts remind consumers to try to buy masks that are packaged and have "LA" (Labor Protection) labels on them or "LA" and "QS" signs at the same time; pay attention to the product's ID at the time of purchase and check the product name. , production date, name, site, shelf life, product instructions, etc. are clearly marked; masks used in the filter materials are generally processed through a very complicated process, for the one-time use of the product, should not be washed.