Can your mask protect against the new coronavirus?

The filtering performance of net red masks is only 16.5%

　　Faced with the new crown pneumonia epidemic, wearing a mask has become one of the important personal protection methods.

Nowadays, there are a wide variety of mask products, many of which claim to have antibacterial, anti-haze, safety protection and other functions, and even steam heating masks and other functions. Many people buy them for daily protection. Can these products meet the new crown protection? What about the standard?

The particle filtration performance of net red fabric masks is only 16.5%

　　The reporter brought a variety of masks purchased online to the laboratory of the National Textile Products Quality Supervision and Inspection Center, and conducted a particle filtration performance test on a net celebrity elastic fabric mask in accordance with the standards for masks.

Huang Cong, project leader of the National Textile Products Quality Supervision and Inspection Center:

Now we use an aerosol of sodium chloride salt, and then test it, and then the particle size of the aerosol tested is a particle size of 0.075 microns. It is tested by simulating the size of a particle size of this particulate matter in the daily air.

　　The detection machine passes air containing aerosol particles through the mask. Some particles are blocked by the mask, and the aerosol that cannot be blocked passes through the mask to simulate entering the human respiratory system.

Huang Cong, project leader of the National Textile Products Quality Supervision and Inspection Center: The

filtration efficiency is now 16.5%, and

this filtration efficiency is relatively poor

. This filtration efficiency means that only more than 10% of aerosol particles are blocked, and then 80% More than% of aerosol particles pass through this fabric mask. It can only prevent some daily pollen, some dust particles, and some large particles.

　　On the outer packaging of another mask, it is marked as having steam hot compress function, and experts have also identified its protective effect.

Huang Cong, project leader of the National Textile Products Quality Supervision and Inspection Center:

It is actually mainly iron powder, including activated carbon. Its main effect is to absorb peculiar smell and heat.

Its filtering effect can be said to be almost no 's

, it was not prevented some filtering small particles.

How do medical masks block the new coronavirus

　　In the case that ordinary masks cannot meet the needs of new crown virus protection, medical masks have come into everyone's field of vision and have become indispensable daily necessities.

So, how does this thin layer of medical masks help us block the new coronavirus?

　　Labeling disposable medical masks and medical surgical masks on the outer packaging of the product must meet the requirements of particle filtration efficiency, bacterial filtration efficiency, synthetic blood penetration, fabric flame retardancy, gas exchange pressure difference, and even nose clip length. Item standards.

These two kinds of masks are widely used in the prevention and control of the new coronavirus, but the laboratory testing standards of these two products do not mention the filtration efficiency of the virus.

So can medical masks be used for the prevention and control of the new crown pneumonia virus?

Wang Baojun, director of the National Textile Products Quality Supervision and Inspection Center:

Because of this virus, it cannot exist alone. It must be parasitic on an object or material, such as my particle or our saliva droplets.

As soon as we sneezed, if we carry the virus, it will be present on our saliva droplets. This mask blocks the droplet particles. After blocking, it will actually block the virus.

　　Disposable medical masks and medical surgical masks are generally very light and thin. Why can they effectively block fine particles?

Wang Baojun, director of the National Textile Products Quality Supervision and Inspection Center:

If we are just to prevent the inhalation of this particulate matter, it is very simple. We use many other things. I made it very dense and thick.

It can achieve this effect.

But, we have difficulty breathing.

We have to achieve a goal that can block the particles and bacteria, and at the same time, our breathing cannot be blocked too much.

In fact, meltblown non-woven fabrics can particularly achieve this effect.

It has better air permeability. During production and processing, it is finally electret, and electret adds electrodes to it.

In this case, we have some fine particles, which are absorbed by themselves, so it plays such a role.

Experiments to verify the electrostatic adsorption effect of melt blown cloth

　　In order to better observe the electrostatic adsorption effect of meltblown cloth, experts disassembled a medical surgical mask on site and demonstrated an experiment to reporters.

Wang Baojun, director of the National Textile Products Quality Supervision and Inspection Center:

Normal medical masks are our regular non-woven fabrics on the outside and inside, generally cotton-like non-woven fabrics, and their function is actually to wrap the meltblown fabric inside.

After cutting it, we can see that this is a colored outside of us, this is a cotton-like non-woven fabric, very thin.

The inside is also a non-woven fabric, which is very thin.

And this layer is a meltblown non-woven meltblown fabric, its strength is generally relatively low, and it will break if you pull it a little.

　　Because this meltblown cloth is electrostatically charged, in this case, we put this small piece of paper.

After cutting it, try it.

Look, it sucks a lot of paper.

Use this static electricity to adsorb the particles. In this case, the filtration efficiency will be higher.

　　Experts conducted experiments on a variety of mask fabrics brought by reporters one by one. No matter it is ordinary non-woven fabrics or net red elastic fabric masks, they do not have the function of electrostatic adsorption.

The purchase of medical masks needs to find the technical standard number

　　Faced with a dazzling array of mask products, there are big differences from material to function.

So when buying, how should we choose a mask for daily protection against the new coronavirus?

　　Experts said that disposable medical mask products need to meet the various indicators of China's pharmaceutical industry standard YY0969 "Disposable Medical Masks"; medical surgical masks need to meet China's pharmaceutical industry standard YY0469 "Technical Requirements for Medical Surgical Masks".

The protective ability of masks involves many factors such as particle filterability, fit, and nose clip standards.

Therefore, when purchasing masks for daily protection against the new crown pneumonia epidemic, you

need to look at the standard number

to ensure that the purchased masks can play a role in the protection of new crown pneumonia.

Wang Baojun, director of the National Textile Products Quality Supervision and Inspection Center:

It must have a production approval number and a standard number. What standard is it produced according to.

If there is no standard number, don’t buy this as much as possible. Although it may also meet this requirement, it does not have a standard number. It is difficult for you to judge by yourself, so the more formal one is preferred, and the more formal label is preferred. Kind of masks.