What should we do to buy quality masks in the face of haze?

For the entire year of 2015, Beijing’s air quality was classified as pollution level for a total of 159 days. In other words, nearly half of the weather in Beijing in 2015 was polluted, 11% of which even reached severe pollution.

However, Beijing is just a microcosm of China. The haze is like a spectre floating across China.

In the past more than ten years, while China's industries have entered rapid development, the environment is also rapidly deteriorating. Pollution is like an invisible pot lid. We are the embarrassment that this steamer can't get out anyway.

The United Kingdom began to control haze from 1950, the United States began in 1955, and China began to pay attention to and control haze problems in 2013.

However, the reality is that the government has invested a lot of money to deal with pollution, but we still often do not see the blue sky. It is estimated that the number of deaths caused by air pollution in China is as high as 500,000 each year.

Living in China, every breath is chronic suicide. Continue life for yourself, starting with every breath.

The governance of the environment needs to rely on the continuous input of the national government. We can only do this: Prepare a purifier, a fresh air system, and wear protective masks at home.

How to buy a mask

Before entering today’s topic, let’s briefly explain how to pick a mask:

First, look at the nominal filter specifications. Look for regular manufacturers and look for protective labels. There is no standard mask for particulate protection. Don't waste your life trying it out.

We put three mainstream standards of China, the United States, and Europe in one graph, and the corresponding X and Y axis readings are their filtering specifications.

The haze environment in China is mainly non-oily particulate pollutants. You can buy the Y axis (inclusive) right.

Second, not leaking is more critical. Do not blindly pursue the mask filter specifications, but also consider the face fit, leaking masks might as well not wear.

Protective effect of mask = Filter grade of filter material × Adhesion with face

If the seal is zero, then there is no protection.

Third, ensure smooth breathing. The high filter specification is certainly more continuation, but it also needs to pay attention to choose comfortable breathing masks, only free breathing can make the body maintain lasting health.

Fourth, try to buy a breathing valve.

The mask selection criteria described above is the selection criteria for our evaluation.

On the basis of the above, we have chosen big brands such as 3M, Honeywell, UVEX, etc., and selected masks like RZ Mask, Respro, Totobobo, etc., which have a higher volume of marketing in recent years. In order to select more black celebrities, we also chose the masks. Lu Yi, Chai Jing and other celebrities with the same paragraph.

As already mentioned, the protective effect of the mask is determined by the filtering effect of the filter material and the fitting effect with the face. The filtering effect of the filter material is no better, once wearing a mask, it will be no use.

Needless to say about the filtering effect, we have done a small experiment to illustrate its importance in terms of adhesion. We asked two male and female examiners with different facial conditions to wear the same 3M 9502V mask and measure the particulate matter inside and outside the mask. concentration:

As can be seen from the figure, the mask of the same filter specification:

In the correct wear, masks and face close together, the filtering effect is as high as 97.2%

In the correct wear, masks and poor face adhesion, the filtering effect is only 68.3%

Therefore, in this evaluation, we focused on the filterability and adhesion of masks.

We used the TSI DustTrak II Aerosol Detector 8532 for testing.

The TSI DustTrak II 8532 is a hand-held PM2.5 detector that uses aerosol scattering to measure aerosol values. It can detect PM1, PM2.5, and PM10 concentrations. The measuring range is between 0.001 and 150 mg/m3. The domestic price is approximately RMB 65,000.

The filterability of the test requires firstly pollutants. The national mandatory standard GB2626-2006 uses salt particles (NaCl) and oil particles (corn oil particles) to test the protective effect of the mask. However, we are more concerned about the actual protective effect of masks in the environment, so we use common pollutants (such as the Royal Park air, secondhand smoke or something).

However, in the past two days when we evaluated the masks, Beijing’s strong winds from the night and AQI fell below 20, and the blue sky was clear and cloudless. We had to create a second-hand smoke gas chamber, so that the concentration of pollutants in the room reached more than 300μg/m3, and the peak value had exceeded 2000μg/m3.

What is the concept of this value? When converted to AQI, indoor pollution levels have exceeded severe pollution.

We covered the filter material of the mask directly on the air inlet of the instrument, sampled for 1 minute, and averaged the sampling time.

The following 4 masks have almost no filter effect, and are not as good as a facial tissue. They can be eliminated directly:

Some friends may ask why three masks with "no filter" were selected for evaluation? In essence, PITTA and 3D are masks that can only prevent pollen, but all kinds of domestic shameless merchants openly declare that XX is the same as anti-fog and haze.

The following 9 test results have a certain gap with the nominal filtering effect, because the test method and the laboratory test method are inconsistent. We think that the error is caused by different test methods. However, there are still some protective effects against smog:

The remaining 27 masks have reached or even exceeded their nominal filter specifications.

Summarized in one sentence is to try to buy a big brand of masks, at least in the filtering effect will not be a problem.

As the name suggests, the masking effect of the mask and the face is tested. We used the TSI PortaCount Respirator Fit Tester 8038 for testing.

The instrument can quantitatively measure all types of respirator, gas masks, SCBAs, respirator, and disposable masks. It is mainly used by chemical experimenters, workshop workers, and respirators used by mine workers. It is the most suitable for our evaluation requirements. instrument. The domestic price is about 150,000 yuan.

Thanks again to TSI of the United States for their great support.

In this evaluation, we used the OSHA 29CFR1910.134 standard from the United States. The entire process was a total of 7'15''. We examined the performance of masks worn in the actual environment.

The experiment is divided into 8 steps:

Normal breathing, 1min

Take a deep breath, 1min

Shake his head left and right, 1min

Nod up and down, 1min

Normal speaking, 1min

Facial distorted grimacing, 15s

Bending, 1min

Normal breathing, 1min

A final score of more than 100 is qualified and the instrument has an upper limit of 200.

In this test, the national standard will be based on the dimensions and standards of the normal population in China to create a head model and a breathing simulator. In order to illustrate the problem as much as possible, we used three live testers: a high nose male face, an ordinary Asian female face, and an ordinary Asian male face.

Of course, three faces still cannot cover everyone's situation. If your facial condition is very different from ours, we suggest that you choose our preferred choice directly, or you can purchase a mask yourself and simply simulate the self-test according to the OSHA criteria above. Place your hand on your cheek and nose to test for leaks.

The following 11 masks were extremely poor in terms of adhesion performance. During the test, the three panelists experienced a leak. We believe that Chinese people cannot buy it. Turn around and let your friends see:)

In addition, European and American masks represented by 3M, Honeywell, and UVEX are not friendly to most Asian faces. We only recommend that friends with longer faces and more three-dimensional noses should consider:

In the adhesion, we can sum up these laws (the bold part is the focus ah students!):

Head-mounted masks are significantly better than ear-wearing masks, but if the ear-bands have hooks they are also very good;

Respiratory valve can be used as a single guide to reduce the displacement of the mask during exhalation, which is helpful for adhesion;

European and American brands such as 3M, Honeywell, and UVEX need to pay attention to the purchase of smaller-faced friends;

The non-woven masks sold by PITTA, 3D, and roadside pharmacies are essentially masking a piece of cloth in front of the nose and mouth. They only have certain resistance to large particles and droplets.

All kinds of sports masks, such as Respro and RZ Mask, have very poor adhesion and are not useful to you. Do not buy them.

The Green Shield and the Chinese body Beili are designed with non-woven fabrics and filter plates. The filtering effect is no problem, but the adhesion performance is unsatisfactory;

Founded in 1902 in Minnesota, USA, 3M was originally known as Minnesota Mining and Manufacturing Company, Minnesota Mining and Manufacturing Company. Has more than 55,000 products.

The performance of the 3M masks was very stable. In addition to the slight difference between the two masks and the nominal effect, the others had passed the tests. For Asian men with a more three-dimensional face, 3M generally does not have problems, and male compatriots can feel comfortable buying. But this time there is also a superb 3M mask.

3M 8576

About ¥37/only

Adhesion: 200+ / 200+ / 200+

Filtration standard: P95 | Measured filter effect: 99.5%

Breathing valve: Yes

Origin: United States/China

All performances of the 3M 8576 have passed the test perfectly. In the test of adhesion, it has also shown a full 200+ performance. We think this is a good mask for most people.

However, it should be noted that the 8576's protection level is P95, which can filter both oily and non-oily particles, mask resistance is large, and friends with poor respiratory function need to pay attention when purchasing.

Takamatsu, a Japanese brand with a very low reputation in Japan, was founded in 1917. The company's full name is "Kyosong Manufacturing Co., Ltd." and is one of the best manufacturers of respiratory protective equipment in Japan. Before the Japanese Prime Minister Abe visited the site of the accident at the Fukushima nuclear power plant, he also wore protective masks for production. Chai Jing also uses the DD11V mask everyday and was photographed by Zhuo Wei.

After the leakage of the Fukushima nuclear power plant in 2013, Shinzo Abe went to visit and used protective masks produced by Komatsu. The red cap in the picture is Abe.

Stress is very bad or disdain for marketing. So that until this mask evaluation, we only noticed it. The three heavy loose masks chosen this time did not disappoint us.

The three loose masks were very good in this evaluation, and they supported the backbone of the Chungson brand!

DD11V

About ¥30/only

Adhesion: 200+ / 171 / 200+

Filtration standard: N95 | Measured filtration effect: 99.1%

Wearing method: wearing/wearing

Breathing valve: Yes

Origin: Japan

Note: The three values ​​of adhesion are high nose, Asian female, and Asian male. More than 100 are tested. Same as below.

Let us first describe the filtering effect. In our test, the filtering effect of DD11V reached 99.1%, far exceeding its nominal N95 specification.

Female tester's test results, there was a significant air leakage after the grimace + bending

In the performance of adhesion, the two male testers all scored 200+ points for all items, except that the female tester experienced a gas leak after bending over, but recovered well. The final score is also close to excellent standards.

Masks use a keel supporting the interior space and provide outstanding recovery performance. After talking, grimacing, or bending over, masks will shift slightly but will quickly recover.

Use the hook on the strap to increase stability when worn. And the cloth on the side of the face extends inwards, which is why the DD11V can adapt to various face types.

In general, the heavy-duty DD11V is the most recommendable mask among all the evaluation products. Although the price is not very beautiful, but a penny, a dollar, a dollar, worth buying.

DD01, DD02

DD01 about ¥14.5/only, DD02 about ¥12/only

DD01

Adhesion: 190 / 159 / 200+

Filtration standard: N95 | Measured filter effect: 96.7%

Wearing method: wearing

Breathing valve: none

Origin: Japan

DD02

Adhesion: 200+ / 200+ / 188

Filtration standard: N95 | Measured filter effect: 97.1%

Wearing method: wearing

Breathing valve: none

Origin: Japan

Like DD11V, the filtering effect exceeds the nominal N95.

The only downside is that neither of them has a breathing valve. Wearing the mask for a long time may be slightly boring. In the purchase link we also gave a homogenous mask with a breathing valve that can be purchased.

In all fairness, for his own life, the choice of masks should not be embarrassing. However, this evaluation of 3M also has relatively affordable players, big-faced friends can buy. The friend with a small face (or who thinks he is a little face) is just following the above purchase.

The 3M 9005 (KN90 approx. ¥4/piece) is an ear-mounted mask, but there is an additional neckband buckle on the belt that can be worn from the ear-wearing type to the head-mounted type, greatly improving the adhesion. The disadvantage is that there is no breathing valve.

PE Granulating Line

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Zhangjiagang Langbo Machinery Co. Ltd. , https://www.langboextrusion.com