Anti-mite effect encounter "can not be measured" "can not tell"

Haze, a strange word that was quite strange five years ago, is now appearing in our lives. When we are inattentive, we are ten-pronged and we don't know when it will come. We don't know when it will go. The prevention of floods has become a very important topic. Flood control requires scientific concepts and methods. Standards, inspections, and other quality technologies and techniques are a group of effective "combination punches." Recognizing this group of "combination boxing" and giving this group "combination boxing" and then playing this group of "combination boxing" in order to contribute to the prevention of verbal abuse is the purpose of this report today. Can give readers inspiration and help.

The air quality that cannot be optimised makes “fog and haze” and “PM2.5” become hot words in people's mouths. The so-called “fighting artifacts” such as “flood masks” and “PM2.5 air purifiers” are also subject to crazy buying. What is the flood prevention effect of the "Fighting artifact?" Put on a “hit-proof mask” and open “PM2.5 air purifier”. Will it be able to withstand invisible and inaccessible PM2.5 fine particles?

Masks: Anti-mite effect cannot be measured

“At present, there are no national or industry standards for flood prevention masks in China. Therefore, no domestic testing agency has been able to detect the true and accurate effects of PM2.5 masks.” Jiangsu Special Security Products Quality Supervision and Inspection Center Director Lu Bing told reporters. Just over a month ago, Jiangsu Province's special security product quality inspection center just completed a risk monitoring of the quality of various masks sold on the market.

"The risk monitoring total purchased 162 batches of samples, including 70 batches purchased in the Nanjing market and 92 batches of online shopping." , disposable masks, industrial dust masks and PM2.5 protective masks. “Because there are no national or industry standards for civil masks, our detection of PM2.5 respirator masks can only draw on the two existing national standards, and combines the two standard detection methods. One is GB2626-2006 “self-priming "Filter-type particle respirator", which is the quality standard for industrial masks; the other is GB19083-2010 "Technical Requirements for Medical Respirator", which is the quality standard for medical masks." You can see from the risk monitoring summary table. The test items include “filtration efficiency” and “air flow resistance”. These two items are also the two items required by the national standards, and there are also tests for pH and formaldehyde content. "Filter efficiency represents the ability of masks to filter particles and pathogens. Respiratory resistance to a certain extent reflects the comfort of wearing masks." Su Hequn said that some manufacturers send products to foreign laboratories for testing. From the inspection report, The main test items are also focused on the two aspects of “filter effect” and “respiratory resistance”.

Through inspections, Su Hequn found that masks against the name of PM2.5 were not effective. The test results show that the masks purchased on the market are PM2.5 respirator masks. The filtration efficiency is 90% or less and less than 50% of the total. The quality is uneven.

Su Hequn specifically emphasized: "Because there is no special quality standard, the data of this test can not be used as a basis for determining whether or not the protective quality of PM2.5 protective masks is qualified, and it can only remind consumers to purchase masks that suit their needs. ”

The lack of relevant quality standards led Yue Weihua, director of the materials inspection division of the Beijing Medical Device Inspection Institute, to be very cautious when undertaking the company's entrusted inspections. “We can only rely on corporate standards or technical requirements commissioned by customers, and based on our existing qualifications to determine whether we can commission the inspection of the tested products.” Yue Weihua said that they do not recommend that companies mark “products PM2.5", "prevention" and other words. "Because, after all, there are no uniform standards, and how protective the effect is, we cannot dare to assert."

Su Hequn also disclosed that the Jiangsu Provincial Special Safeguard Product Quality Inspection Center, as one of the major drafting units, is working on drafting national standards for civil masks. "The standard will regulate the antibacterial rate, basic structure, pH value, and formaldehyde content of masks."

Air purifier: The clarification effect is not clear

Like masks, "purifying PM2.5" became the main selling point of air purifiers. However, when a reporter asked how to detect the purifying effect of an air purifier, a salesperson at a supermarket in Chaoyang District, Beijing, said that the purifying effect was difficult to detect because the particles in the air were too small to be detected by the naked eye. Dust on the Internet shows that there is a purifying effect.

Can these air purifiers effectively remove PM2.5 particles? The reporter noticed that many brands of purifiers will specify on-site or product introduction air purification effect detection units, and these testing units can be described as "various".

“At present, there is no unified standard for the effect of PM2.5 purification on air purifiers.” Li Long, deputy director of Jiangsu Metrology Center for Metrological Quality Supervision and Inspection Center (Suzhou Metrology and Measurement Institute Park) told the reporter: “China There are many standards concerning air purifiers, GB4706.45-2008 "Special requirements for safe air purifiers for household and similar electrical appliances", GB21551.3-2010 "Antibacterial, sterilizing and purifying functions for household and similar electrical appliances. The special requirements of the device and GB/T18801-2008 "Air Purifier" and other national standards stipulate the technical requirements such as electric strength, leakage current, hygienic safety, clean air volume, purification efficiency, and noise of the air purifier. Since China began to increase investment in research on PM2.5 from 2011, relevant testing standards have not yet been issued, so the original standard only requires the PM10 purification effect, and there is no requirement for the PM2.5 purification effect.”

In order to help consumers better select air purifiers, in February this year, the center completed the comparison experiment of 20 brand air purifiers. The experiment drew on the relevant testing requirements of GB/T18801-2008 "Air Purifier". According to the comparison test results of the PM2.5 purification efficiency provided by the center, among the 20 air purifier products, the best PM2.5 purification product reached 99.56% in 20 minutes, and the “performance” was the worst The product was only 72.28%; after 60 minutes, the PM2.5 purification efficiency was 99.999%.

Laboratory testers specifically stated that: "Because there is no provision for purifiers' detection of PM2.5 purification effects in the national standard, this test will reveal only the differences between the initial PM2.5 concentration and the detection environment and methods. The difference in the PM2.5 purification capability of the purifier brand, the data provided is not the final indicator of the PM2.5 purification capability of the instrument."

Due to the lack of uniform quality standards, "flood protection masks" and "PM2.5 air purifiers" are worth mentioning. At present, it is impossible to accurately judge the effectiveness of flood prevention. Experts called for the establishment of relevant standards as soon as possible, the establishment of relevant testing methods, and the scientific and accurate detection of the quality of these flood prevention products.

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