What is the Weathering Test in the Laboratory? Everything You Need to Know Laboratory weathering testing recreates the combined effects of sunlight (UV radiation), heat, moisture, and other climatic stressors to assess how materials — plastics, coatings, textiles, or composites — will perform over time. Using specialized weathering chambers, samples are exposed to cycles of UV light (simulating sunshine), alternating with moisture (dew, rain or condensation), temperature fluctuations, and humidity. These conditions accelerate deterioration mechanisms such as fading, chalking, cracking, brittleness, loss of gloss or mechanical strength, and chemical breakdown. By measuring changes after testing, manufacturers can predict lifespan, improve material formulations, and ensure long-term durability — especially for products intended for outdoor use. https://www.prestoenviro.com/blogs/what-is-the-weathering-test-in-the-laboratory