As you all know, the smaller the ultraviolet transmitta […]
As you all know, the smaller the ultraviolet transmittance, the better the protection. The ability of different materials to prevent UV transmission is not the same, but how to measure UV transmittance may not be known to many people, because so far, the country has not issued a unified standard for detecting UV protection. Here are some simple tests. Method to use when choosing an promotion umbrella.
Such as silver plastic umbrella surface, ultraviolet transmittance is 0.01%; white cloth surface umbrella transmittance is 0.98%; linen fabric is 2.17%; fabric fabric is 9.92%; nylon silk fabric is 10.34%. Of course, the smaller the ability to pass, the better its protection is. This is beyond doubt. Through this rough test, you can understand that nylon silk is the worst, so if you buy an umbrella for UV protection, it is best not to pick this fabric.
In fact, there is a simple way to measure the UV protection effect of the umbrella: Take a few umbrellas, advertising umbrellas, choose different materials, put it on the outside, and put a thermometer of the same type inside. After 10 minutes exposure, observe. The temperature difference between the inside and the outside of the umbrella, the large temperature difference is the effect of good UV protection, and vice versa is the effect of poor.
But we have to figure out a problem, we are testing here is the degree of UV protection of the umbrella, which is accounted for in the perspective of you need a good umbrella, this umbrella with the umbrella of the wholesale market you see the quality of the umbrella is Two problems, not necessarily the quality of anti-UV umbrellas with good quality, is not a concept.