At present, in the ultraviolet aging test chamber, there are two ways to expose the sample to moisture: condensation and water spray. Condensation is a condition often used in UV aging tests to simulate condensation. The condensation is formed by exposing the test surface of the sample to heated, saturated water vapor in the dark section of the procedure. In a confined space surrounded by the sample holder, the relative humidity is typically 100%. The back side (non-test surface) is exposed to the cooling air of the room temperature, causing the sample temperature to drop below the dew point, thereby producing condensation on the test surface of the sample. The water spray in the UV aging test chamber is to simulate the rainfall in nature and produce thermal shock effects on the sample. Water spray is generally used in tests for testing outdoor materials. In the ultraviolet weathering test chamber, nozzles are used to spray deionized water or higher purity water onto the exposed surface of the sample. The water spray or not and the time interval between water sprays can be automatically controlled by the program.
Outdoor materials can be exposed to moisture for up to 12 hours a day, and the results suggest that the main cause of this outdoor humidity is dew, not rain. If you are unable to solve the problem in technology, you can call Shanghai Jianhu Instrument Equipment Co., Ltd.!
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