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Accelerated Outdoor Weathering: EMMAQUA

Date Event Location Country Language Type
Jun 08, 2021 Accelerated Outdoor Weathering: EMMAQUA Online EN Online Seminar Register
Jun 23, 2021 Accelerated Outdoor Weathering: EMMAQUA Online EN Online Seminar Register

Event Information

"Accelerated outdoor weathering with linear Fresnel-reflecting concentrators that follow the path of the sun and concentrate solar radiation onto the test specimen is well established (see e.g. ASTM G90). The use of natural solar radiation often results in degradation processes that are very similar to those observed in static outdoor weathering. Rain and dew can be simulated by spraying the specimen with deionized water. Since traditional mirrors concentrate the entire solar spectrum, substrates with poor thermal conductivity, such as plastics or composites, are usually not suitable, as they can easily overheat and be thermally decomposed. Coatings on substrates with good thermal conductivity, such as metals, can, however, be effectively cooled from the rear with air and are therefore usually very suitable. A more recent development in accelerated outdoor weathering is the use of so-called “cool mirrors” (CM), which mainly reflect UV and short-wave visible, but not infrared radiation. This results in much lower specimen temperatures compared to traditional mirrors. This enables temperature-sensitive materials to be tested."