Most Sunscreen Clothes Are Hard To Protect Against Ultraviolet Radiation.

Sunscreen, with its bright candy color, is especially popular this summer. clothing Markets and online shops can be seen everywhere. Recently, reporters asked professional laboratory testing found that 4 sunscreen clothing, only one UPF value (UV protection coefficient) reached the standard, most sunscreen clothes are difficult to prevent UV.

　　 Sunscreens with different types of sunscreens are very different.

Recently, 4 sunscreen suits were purchased. The laboratory staff of the school of materials science and engineering of Beijing Institute Of Fashion Technology conducted 4 small experiments on these sunscreens, including UPF value, light transmittance effect, contrast of grain density, and titanium content, four indicators related to sunscreen. It was found that most of the sunscreen clothes were inaccurate, and the sunscreen effect was very different. 4 UPF sunscreens were less than 30, and the sun protection effect was similar to that of ordinary clothes.

Among them, a fluorescent green candy hat sunscreen sweater purchased from Tmall is declared to be "genuine sunscreen against UV", "can block 80% of the light through", the actual UPF value is only 27. Another brand of white shirts selected from consumers is rated 30+, but the actual level is only 20+.

　 Do not ignore air permeability for sunscreen effect.

Gong Yan, an associate professor at the school of materials science and engineering, Beijing Institute Of Fashion Technology, said that most of the current sales of sun protection clothing on the market are mostly a marketing concept of business hype. If its UPF value is less than 30, it will be more common. clothes Almost, even worse than some ordinary clothes, because ordinary clothing itself has the role of shielding the sun.

In addition, he reminded consumers that the greater the density of clothing material, the more sunscreen; the darker the color, the higher the UV protection performance. But we can not simply pursue the effect of sunscreen, ignoring the air permeability of clothing, and some inferior quality. cloth The sun protection clothing is too tight, moisture absorption, poor ventilation, wearing airtight, but may cover up prickly heat, small rash.

　 Many sunscreen clothes are "three no" products.

Experts say that qualified sun protection clothing should be marked with clothing materials, implementation standards and UPF value and other information.

In various sales places, the price of sunscreen clothing ranges from 20 yuan to 1000 yuan, most of which are concentrated in 100 yuan.

The fluorescent green sunscreen shirt bought by Tmall from a shop in Zhejiang has a price tag of 23.98 yuan, indicating that its monthly sales volume is more than 140 thousand. However, the sun protection clothing, which claims to be "genuine sunscreen and UV protection", does not see any material and sun protection signs, but it can not even see the implementation standard and UPF value.

Similarly, the pure white sun protection clothing purchased from Fengtai road Tong market does not see any tag tag. Sunscreen clothes like this without signs can be seen everywhere in many markets. "Such sunscreen clothes sell very well, and the price is not expensive." A shopkeeper said. But when asked by reporters and their SPF, shopkeepers said they didn't understand very well. "They know that they can protect against ultraviolet rays and how much they can wear."

Some brands of sun protection clothing, sunscreen effect has not been marked. A brand of multi-function ultra-thin sunscreen clothing bought by Van Kok Pin from the company is marked by FZ/T81010-2009 on the tag and UPF value is not indicated.

Gong Yan, associate professor at the school of materials science and engineering, Beijing Institute Of Fashion Technology, pointed out that sunscreen is mainly against ultraviolet radiation. Spin The standard of UV protection is the evaluation of the anti ultraviolet property of textiles (GB/T18830-2009), which stipulates that when the UPF value of clothing is greater than 30 and the transmittance of UVA is less than 5%, it can be called anti ultraviolet product. Therefore, if it is a qualified sunscreen clothing, it should be marked on the tag, clothing material, the implementation of standards for GB/T18830-2009, and UPF value and other information. {page_break}

　 Tips: common people should use traditional sunscreen.

Buy sunscreen, depending on the SPF, and whether it's breathable. A good sunscreen can not only prevent ultraviolet rays, but also sweat quickly to the surface. There must be 3 Contents in the tag tag of regular UV protection products: first, the implementation standard is GB/T18830-2009; two is marked with UPF value 30+ or 50+; three is to remind long-term use and under tensile or humid conditions, the protection performance of this product may be reduced.

* the general population can use traditional sunscreen methods, sunscreen, sunshade, sunshade hat and long trousers.

Pay attention to eating less sensitive foods such as coriander, celery, leek, fennel and so on. Eat more foods rich in vitamin B, and help to reduce UV damage to the body.

Experiment

Setting: Laboratory of College of materials science and engineering, Beijing Institute Of Fashion Technology

Experimental samples: a "genuine anti UV" Fluorescent Green candy hat sunscreen shirt bought from Tmall; a brand of rouge red multifunctional thin breathable skin windbreaker from Vic online; a pure white sun protection clothing purchased from Fengtai Rutong small commodities market; a consumer brand of white sunscreen shirt; a black T-shirt from home.

　　 Experiment 1: the thinner the textile lines, the more sunscreen they can get.

Experimental process: put 3 sunscreen clothes bought by reporters under magnifying glass, showing the texture of textiles.

Results: pure white sunscreen has the finest texture, and the density of carmine's sunscreen clothing is medium, and that of fluorescent green is the thinnest. The experimenter told reporters that in general, the thinner the textile lines, the better the sunscreen effect. However, summer clothing is too close, but it will cause air tight and not very good.

　　 Experiment 2 UV penetrated many sunscreens with poor effect.

The process of experiment is to turn on the ultraviolet analyzer and to put down a blank sheet of paper. The 3 outer parts of sunscreen clothing purchased by reporters were analyzed towards the analyzer. They were wrapped and covered to simulate the environment of ultraviolet radiation to see the effect of ultraviolet light transmission.

The experimental results showed that the light of carmine's sunscreen was the most dim after covering the instrument. The experiment points out that ultraviolet radiation does not penetrate very much, and its UV protection effect is the best. The other two fluorescent green sunscreen clothes and pure white sunscreen clothing are more penetrated by ultraviolet rays, and the light exposure is much brighter on the white paper. Under normal circumstances, consumers can use ultraviolet devices at home to identify small devices.

　 Experiment 3 the higher the titanium content, the better the sunscreen effect.

Experimental process: using X- fluorescence spectrometer to test the titanium content of 3 sunscreen clothes purchased by reporters.

The results showed that after testing, the titanium content of 3 sunscreen clothes was carmine, > fluoro green > white, and the sunscreen effect decreased in turn. The lab told reporters that titanium is the necessary finishing agent for physical sunscreen.

　　 Experiment 4 only a sunscreen dress is "worthy of the name".

During the experiment, a small sample of clothing samples was cut from 5 samples and tested by UV visible near infrared spectrophotometer. The sample wavelength was controlled between 320nm-400nm and UV transmittance was measured. At the 356nm wavelength, the transmittance of ultraviolet light is displayed, and then the UPF value is calculated.

Experimental results: the experimental personnel introduced, the UPF value is the ultraviolet protection coefficient, the higher the UPF value, the better the ultraviolet protection effect. In accordance with the recommended national standards, only the UPF measurement value is greater than 30, that is, 30+ is called "sunscreen clothing". And through the experimental test, 3 declared sunscreen clothing, the actual UPF value is less than 30, no difference from ordinary clothes.