There are several factors that determine the sun umbrellas effect of parasols: fabric color, protection level, fabric material, etc. Ordinary sunshades can also block out part of the ultraviolet rays, about 70%, but cannot block the reflected ultraviolet rays. Therefore, it is best to choose a sunshade with an anti-ultraviolet coating when outdoors. A good sunshade can block more than 95% of the ultraviolet rays.

    The color of the fabric also plays a role in UV blocking. The deeper it is, the lower the UV transmittance and the better the UV protection performance. Generally, dark umbrella cloth can block 95% of UVA. Under the same conditions, the darker the fabric, the better the UV resistance. In contrast, black, navy blue, and dark green have better anti-ultraviolet effects than light blue, light pink, and light yellow. Therefore, it is best to choose a sun umbrella with a dark color.

    Generally, the commonly used fabrics for sun umbrellas include impact cloth, black tape, nylon cloth, polyester cloth, etc. Among them, the impact cloth is also called PG cloth, which belongs to the first-level UV protection umbrella cloth. The UV effect is better; the black tape has good UV resistance, is stable and does not easy to fall off, and is insulated from light while shading; nylon, also known as nylon, has good elasticity and wear resistance, but the shading effect is not ideal, only with silver glue Or pearl color glue has an anti-UV effect.