Is There Any Specific Index For Sun Protection Performance Of Sunscreen Clothing?

Many ordinary

It also has anti UV properties. The UV protection of the same clothing is darker than that of light color.

Thicker than thin, good fabric structure is better than loose.

In addition, the UV protection performance of clothing may decrease with the increase of washing times and the stretching of clothing.

In recent days, a light and beautiful sunscreen is necessary for many citizens in summer.

But the reporter interviewed found that the market is selling.

Most of them do not specify the UPF value (UV protection index) according to the regulations, but the material and quality are even uneven.

More experiments show that the price of counterfeit sunscreen clothing is several times higher than that of ordinary shirts, but the effect of sunscreen is not necessarily stronger than that of dark shirts.

According to the reporter's visit, whether it's in a brand store or a clothing store on the street, this kind of sunscreen suits with plastic, pparent and bright colors are sold, ranging from 3 to 50 yuan to several hundred yuan.

These sunscreen clothing materials are not the same, most of them are polyester, and some are nylon, and the sunscreen clothing is the "nano coating".

Reporter's enquiry found that in 2011, China launched the latest assessment standard "textile UV protection performance evaluation", which expressly provides that only when the UPF value of clothing is greater than 40, and the pmittance of UVA (the strongest penetrated UV) is less than 5%, it can be called "anti UV products". The higher the UPF value, the better the sunscreen effect.

There are three requirements for the formal tag of sunscreen clothing: one is to require the goods to mark the UPF value on the tag, and the other is to remind consumers on the tag that the protective performance of the product may be reduced if it is used for a long time and under the condition of stretching or wet. Two

Finally, it is necessary to indicate that the standard used for testing the clothing is the evaluation of the ultraviolet radiation resistance of textiles, and the number of the evaluation standard should be given on the tag.

However, yesterday, the reporter visited twenty "sunscreen clothing" counters found that 80% "sunscreen clothes" on the label did not have clear sunscreen parameters.

Spot check: nearly 80% sunscreen clothes are not UV protected.

In July last year, the Jiangsu Quality Supervision Bureau released the "quality control analysis report on the inspection of anti ultraviolet clothing in 2015". A total of 82 batches of samples were selected, and the "UV protection product" rate was only 26.8%. Nearly 80% of the sunscreen clothes did not have the function of anti ultraviolet.

The sample accords with the requirement of permeability is 31 batches, with a coincidence rate of 37.8%, while 5 batches with better UV protection and better air permeability account for 6.1%.

Reporters learned that the general fabric is to increase the coating to play the role of UV protection, the thicker the coating, the better the UV protection effect, but the increase of coating will lead to poor permeability of the clothes, easy to feel bored.

In addition, washing will also reduce the UV protection index of sunscreen clothing.

Experiment: cotton T-shirt sunscreen effect is not bad.

Ye Linhua, an associate professor of Optics Research Institute of Zhejiang University, has measured three kinds of sunscreen clothes. The first one is orange cotton sunscreen suit, which is different from the ordinary cardigan.

The second is sunscreen suits that look like ultra-thin plastic raincoats.

The third one is a white high grade sunscreen suit with a slightly higher price.

Three sunscreen suits were tested under the single layer condition. The results of the first two measurements showed that the UVB pmittance reached 12% and third pieces were 28%, which exceeded the 5% stipulated by the state.

The three sunscreen clothes were folded into two layers. The test results showed that the pmission rate of UVA was reduced by more than half.

One of the most common cotton white T-shirts found at random is only one layer of fabric, and the UVB pmittance is only 7%.