Do Not Be Fooled By Online Shopping Haze Prevention Masks.

< p > here the world is < a target= "_blank" href= "http://www.91se91.com/" > dress < /a > a target= "_blank" href= "_blank". < /p >
< p > the continuous fog and haze over the past two years has led many people to start using protective masks. So, what are the effects of all kinds of protective masks, such as "PM2.5 protection", "isolated dust" and "anti haze"? Are they good? < /p >
< p > < strong > sampling hundreds of masks < /strong > /p >
< p > < strong > are all hot selling brands < /strong > < /p >.
Less than p days ago, the Zhejiang Provincial Consumer Protection Commission made a comparative test of all kinds of masks sold on major websites. The results showed that the masks of the 25 batches did not meet the national standard requirements of GB 2626-2006. The difference between the filtering results of goods was relatively large, and the lowest filtration effect was only 5%, the highest being 82.2%, which was totally unrelated. < /p >
< p > it is understood that the Zhejiang Provincial Consumer Protection Commission has purchased online shopping samples on four commercial websites of Tmall, Jingdong, Amazon and No.1, including 8 batches of Tmall adult masks, 2 batches of children's masks, 5 batches of children's masks, 2 batches of children's masks, 5 batches of adult masks, 2 batches of children's masks, 5 batches of adult masks, children's < a href= "http://www.91se91.com/news/index_f.asp" > mask > /a > 2 batches, and a total of 31 samples. Basically, these products sell well on the Internet. < /p >
< p > "but because there is no commodity information on multiple packages, it can not be included in the testing area. The final sample is 25 batches and 15 samples for each batch." The relevant person in charge of the provincial consumer protection committee told reporters that all samples were entrusted to the Shanghai labor protection products quality supervision and inspection station for testing. < /p >
< p > in order to make the detection more scientific, each batch took 15 samples, 10 of them were untreated samples, and 5 samples were pretreated by temperature and humidity. Before the experiment, the filter material was pretreated at high temperature, low temperature and high humidity, which represented the corresponding working environment. It is understood that the test is based on the GB 2626-2006 respirator respirator standard, and the efficiency of respirator filtration is tested. Filtration efficiency refers to the percentage of particulate matter filtered by a filter element under specified test conditions. It is one of the most important technical indicators of respirators. < /p >
< p > the lowest filtration efficiency can be divided into the following three grades. The "90 grade" indicates the minimum filtration efficiency is 90%. The "95 grade" indicates the lowest filtration efficiency 95%, and the "100 grade" indicates the lowest filtration efficiency 99.97%. In the filtration efficiency test, the detection conditions are: 85 liter / minute air flow, experimental particle concentration (not more than 200 mg / m3) and sodium chloride particles with 0.075 micron particle size distribution through the filter element to measure filtration efficiency. < /p >
< p > < strong > the minimum filtration effect is only 5% < /strong > < /p >.
< p > < strong > the highest is 82.2% < /strong > < /p >.
< p > the final test results showed that the respirators of 25 batches did not meet the national standard requirements. The difference between the filtration efficiency of the products was relatively large. The lowest filtration effect was only 5% (the green respirator mask produced by Beijing central Europe Puri Technology Co., Ltd.). The highest filtration efficiency was only 82.2% (known as the comfortable and refreshing wrinkle mask produced by Shenzhen yuan Co., Ltd.). The 21 batches of products are concentrated in 5%~30%, including products from Beijing Cheng Kai Hengye, Shenzhen Yue Tengda, Suzhou Lotte protection, Xuzhou Bede and other enterprises. < /p >
< p > unqualified products also have some well-known brands, such as the nominal 3M China Limited < a href= "http://www.91se91.com/news/index_c.asp" > Company < /a > produces 3M comfortable Kang comfortable thermal respirator (children's type) filtering effect is 30%; nominal Shanghai Shang Yuan Trading Co., Ltd. MASK comfortable mask filter rate is only 14.1%; Shanghai Connaught connon fiber Polytron Technologies Inc's Green Shield PM2.5 anti-bacterial and anti haze mask. < /p >