Why is it black inside the sun umbrella?

The black thing on the inside of the sun umbrella is an effective coating material to prevent ultraviolet rays. Without this layer of material, ultraviolet rays can easily pass through the umbrella.

Vinylon is a new type of anti-ultraviolet fabric, which is characterized by enhanced anti-ultraviolet, no odor and not easy to age. Silver rubber umbrella is protected from ultraviolet rays by coating, and the quality of coating directly determines the degree of ultraviolet rays protection. Most of the silver rubber umbrellas on the market are ultraviolet-proof in name only, and they are easy to age. It is believed that in the near future, black rubber will replace silver rubber and become a new economical umbrella cloth.