During the outbreak,
Masks have become the standard of daily protection for citizens.
But if I ask you,
Is the mask you bought qualified?
Foshan police destroyed four fake and shoddy masks in succession,
More than 1.2 million fake masks were seized.
The reporter took some of the masks to a professional institution for testing,
What's the problem with fake masks?
There are two kinds of masks for inspection: blue and gray. From the appearance, they are no different from those we wear everyday.
According to reports, masks are divided into three categories: disposable medical masks, medical surgical masks and medical protective masks.
Subsequently, the inspectors used the industry standard of medical surgical masks to test the samples.
First, check the mask tape. According to the standard, the breaking strength at the connection point between each mask belt and the mask body shall not be less than 10N (n). That is to say, the inspector will be cut into 4 pieces of mask belts, tied to the weight of 2 kg respectively, and then pulled up vertically. If they can hold for 5 seconds without breaking, they can pass the test.
The results showed that the blue mask band lasted four seconds before breaking. The gray mask band broke in the moment of lifting the weight.
The second is the pressure difference test, which mainly tests the breathing resistance of the mask. After testing, both kinds of masks are qualified, that is to say, the user will not hold back too much and breathe smoothly.
However, in the most important third "particle filtration efficiency" test, these fake masks are all unqualified.
According to the standard, the filtering efficiency of respirator for non oil particles shall not be less than 30%. This is a core data, especially for the quality of protection during an epidemic. Unfortunately, the test result of gray mask is less than 17%.
Huang Minju, director of Medical Materials Laboratory of Guangdong Medical Device Quality Supervision and Inspection Institute
"As for the data of the blue mask, we can see through the test that the particle filtration efficiency is only about 10%, which is about the same as that of our ordinary paper towels."
The main reason for the unqualified filtering efficiency is that the quality of the melt blown cloth of the mask is not up to standard. There are three layers of cloth inside and outside the mask. The outer layer and inner layer are made of non-woven cloth, while the middle layer is made of melt blown cloth, which can be said to be the "heart" of the mask. It has the function of blocking particles and bacteria and viruses.
Then, the inspector cut off the qualified mask and the mask sent by the reporter respectively, and compared the melt blown cloth through the touch and vision.
Reporter touch found that the two touch the thickness is not the same, the mask submitted by the reporter is like a piece of paper, very transparent.
For visual observation, the mask on the left is obviously thinner.
To remind you,
Purchase respirators, disinfectants and other anti epidemic products
Be sure to use formal trading channels,
To avoid being deceived!