: Uses fluorescent or xenon-arc lamps to simulate sunlight in a fraction of the time. Extrapolation Note
: Degradation is often timed based on solar radiation measurements, though it notes that temperature and moisture also heavily influence results. ASTM International Purchasing and Access (PDF) The official, current version is ASTM G7/G7M-21 iTeh Standards astm g7 pdf
: The standard accounts for critical environmental stressors including ultraviolet (UV) radiation , temperature fluctuations, moisture (rain/dew), and pollutants. Key Testing Procedures in ASTM G7 : Uses fluorescent or xenon-arc lamps to simulate
ASTM G7 refers to a standard test method developed by the American Society for Testing and Materials (ASTM), now known as ASTM International. This particular standard, ASTM G7/G7M, is titled "Standard Practice for Outdoor Exposure Testing." It provides guidelines for conducting outdoor exposure tests to assess the durability and performance of materials, coatings, and other products when exposed to natural weather conditions. Key Testing Procedures in ASTM G7 ASTM G7
: The front surface of the specimen is exposed to the weather.
with known weathering characteristics for performance comparison. Defining Conditions