This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D20 on. It is the responsibilty of the Lab Manager to verify this setup is acceptable for the particular application or test method. ***. Test Method: ASTM D Buy ASTM D PRACTICE FOR XENON-ARC EXPOSURE OF PLASTICS INTENDED FOR INDOOR APPLICATIONS from SAI.
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Xenon-Arc Accelerated Exposure
Accelerated weathering simulates the damaging effects of long term outdoor exposure of materials and coatings by exposing test samples to varying conditions of the most aggressive components of weathering – light, moisture, and heat. A Weather-Ometer uses a xenon satm light source to provide a radiation spectrum that simulates natural sunlight. Glass filters around the xenon arc modify the light spectrum to asmt the appropriate end use conditions.
Moisture is provided by a humidifier and direct spray, and temperature is controlled by heaters.
Microprocessors monitor and precisely control the radiation applied to the test samples. No direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration.
However, performance comparisons under the controlled conditions of accelerated weathering can be compared to documented performance of materials and coatings that have experienced extended periods of end use exposure. Up to 60 test samples are mounted in the Xenon Arc and subjected to a cycle of exposure to specified combinations of light, humidity, temperature and water spray.
Various cycles are defined by the appropriate specifications depending upon the intended end use application. Polystyrene Lightfastness Standards are included among the test samples to monitor and verify the performance of the equipment. These cycles would be continued for extended periods of time – up to thousands of hours – simulating even longer periods of time in the real world. Standard awtm are 69mm x mm.
Smaller sizes, or slightly larger sizes, can be accommodated, but this equipment does not readily accept actual parts.
Xenon-Arc Accelerated Exposure
Accelerated weathering provides exposed samples for comparison to unexposed control samples. Often several exposure times such as, and hours also will be compared to each other. Standards can be obtained from appropriate standard authorities.
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