Currently, in ultraviolet aging test chambers, there are two primary methods for exposing samples to moisture: condensation and water spray. Condensation is a common technique used in UV aging tests to mimic natural condensation processes. This method involves exposing the test surface of the sample to heated, saturated water vapor in the dark phase of the testing cycle. Within a sealed chamber that surrounds the sample holder, the relative humidity can reach up to 100%. Meanwhile, the backside of the sample is cooled by ambient air, causing its temperature to drop below the dew point, which leads to condensation forming on the exposed surface.
On the other hand, water spray is designed to simulate natural rainfall and create thermal shock effects on the material being tested. It is typically used when evaluating outdoor materials that are subject to real-world weather conditions. In the UV weathering chamber, nozzles spray deionized or high-purity water onto the exposed surface of the sample. The system allows for automated control over whether or not water is sprayed, as well as the timing between each spray cycle.
Outdoor materials are often exposed to moisture for up to 12 hours daily, and research indicates that the main source of this moisture is dew rather than rain. Understanding these conditions is crucial for accurately simulating real-world environments during testing. If you're facing challenges in replicating these conditions or need assistance with your equipment, don't hesitate to contact Shanghai Jianhu Instrument Equipment Co., Ltd. for expert support and solutions tailored to your needs.
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