ASTM D5781

ASTM D5781 is a standardized test method used to measure the intensity of ultraviolet (UV) light absorbed by plastics and rubber materials. This test helps determine how well these materials can withstand exposure to sunlight without degrading, which is important for products like outdoor equipment, automotive parts, and packaging. By analyzing UV absorption, manufacturers can assess a material's durability and plan appropriate protections or formulations to improve longevity when exposed to sunlight over time.