What is the Weathering Test in the Laboratory? Everything You Need to Know A weathering test is a controlled laboratory process that simulates sunlight, moisture, heat, and other environmental conditions to evaluate how materials age outdoors. By exposing samples to UV light, temperature cycles, humidity, and condensation or water spray, the test reveals potential problems — such as fading, cracking, loss of strength, or surface degradation — long before real-world exposure. https://www.prestoenviro.com/blogs/what-is-the-weathering-test-in-the-laboratory