ASTM D4329

ASTM D4329 is a testing standard that evaluates how materials, especially plastics and coatings, resist outdoor weathering. It simulates the effects of sunlight, moisture, and temperature changes on these materials over time. By exposing samples to controlled UV light and moisture, this standard helps predict how long they will last and maintain their appearance when used outdoors. Companies use this information to ensure their products are durable and reliable for exterior applications, improving safety and performance in various environments.