Do black umbrellas block UV rays? What to pay attention to

In the summer, ultraviolet rays can cause great damage to people's skin, so when the sun is strong, you need to prepare some parasols and sun protection tools. Many people want to know whether black umbrellas can block UV rays. In this case, it also depends on the umbrella's sun protection function.

1. Professional sun umbrella

Ordinary umbrellas cannot block ultraviolet rays at all. Because UVA in ultraviolet rays is penetrating and can penetrate glass, let alone an ordinary umbrella. It must be a professional sun umbrella. Professional sun umbrellas are not black, and black umbrellas are not very effective in sun protection. It is the same as black clothes. Don't think that the darkest color is the best sun protection. It is a big mistake. Experts show that among all colors, bright red has the best sun protection effect. Black and white have the same sun protection effect. Buy a bright red professional sun umbrella.

2. Pay attention to the fabric structure

The thickness and tightness of the fabric have a certain impact on its UV resistance. The thicker the fabric, the better its UV resistance, and the tighter the fabric, the stronger its light-blocking ability and the less UV light transmittance. Knitted fabrics are usually looser than woven fabrics, so their protective effect is not as good as that of woven fabrics. Among woven fabrics, the gaps in plain weave are larger than those in twill, and the gaps in twill are larger than those in satin, so the protective effect of plain weave is relatively poor. Another thing to pay attention to is the color of the fabric. According to the test results of the China National Institute of Metrology, the darker the color of the fabric, the lower the UV transmittance and the better the UV protection performance. Therefore, when choosing a parasol, we must fully consider the thickness, tightness and color of the fabric.

3. Note

The color of fabric is related to its UV protection performance. Under the same conditions, the darker the fabric, the better its UV resistance. In comparison, black, navy blue, dark green and light blue, light pink and light yellow have better UV resistance.