As we all know, the smaller the UV transmittance, the b […]
As we all know, the smaller the UV transmittance, the better the protection. Different materials have different ability to resist UV transmittance, but how to measure the UV transmittance may not be known to many people. So far, the country has not issued a unified UV detection standard. Here are some simple tests. The method is for you to use when choosing an umbrella.
For example, the silver-coated umbrella surface has an ultraviolet transmittance of 0.01%; the white cloth surface umbrella transmittance is 0.98%; the linen cloth fabric is 2.17%; the flower cloth fabric is 9.92%; and the nylon silk fabric is 10.34%. Of course, the smaller the penetration ability, the better its protection ability. This is beyond doubt. Through this rough test, you can understand that nylon silk has the worst ability, so if you buy an umbrella to protect against UV rays, 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 parasols, advertising umbrellas, choose different materials, put it outdoors, put a thermometer of the same type inside, expose it for 10 minutes, observe The difference between the temperature inside and outside the umbrella, the large temperature difference is that the UV protection effect is good, and vice versa.
But everyone has to figure out a problem. What we are testing here is the degree of UV protection of the custom umbrella, which is considered in the perspective of the umbrella you need to have a good effect. The quality of the umbrella you see with the umbrella wholesale market is Two problems, the quality of the umbrella fabric that is not necessarily good for UV protection is good, so this is not a concept.