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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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What is Salt Spray Testing Procedure for Corrosion Testing
Salt spray testing is an accelerated corrosion method widely used for evaluating the durability of metals and protective coatings under harsh, salt-laden conditions. The process begins with preparing a 5% sodium chloride solution and placing clean test samples into a sealed salt spray chamber at an angle (usually 15–30° from vertical). The chamber maintains a constant temperature — typically around 35 °C — while atomizing the saline solution into a fine mist that envelops the samples continuously. Exposure durations vary from a few hours up to several hundred or more, depending on the standard or customer requirement. After testing, specimens are examined for rust, blistering, pitting, or coating breakdown to determine their corrosion resistance and suitability for coastal, marine, or industrial applications.
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