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A Guide to ASTM B117 for Salt Spray (Fog) Testing
ASTM B117 is the internationally recognized standard for conducting salt-spray (fog) tests to evaluate the corrosion resistance of metals, coatings, and surface-treated components. Under this standard, specimens are cleaned, mounted at a slight angle, then placed in a sealed chamber where a neutral sodium-chloride mist (typically 5 % by weight) is continuously sprayed under controlled conditions (about 35 °C, pH 6.5–7.2, high humidity). Over a specified exposure period — from a few hours to thousands — the samples are inspected for rust, pitting, blistering or coating failure. The results provide a comparative measure of durability and help validate protective coatings or surface treatments before real-world deployment.
https://www.prestoenviro.com/b....logs/guide-to-astm-b
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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.
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