Many materials used in products and infrastructure are exposed to sunlight for long periods. Ultraviolet (UV) radiation from the sun can gradually degrade materials such as plastics, polymers, coatings, rubber, and textiles. Continuous exposure to UV light may cause fading, cracking, discoloration, or loss of mechanical strength. To evaluate how materials perform under such conditions, manufacturers conduct UV resistance testing. This testing method simulates the effects of sunlight in a controlled environment, allowing manufacturers to determine how materials will behave after prolonged exposure to ultraviolet radiation.