14 ноября, 2015 
Pokraskin While weather fastness may be evaluated by exposing the sample to actual outdoor conditions for a prolonged time, accelerated tests are more commonly used in industry. In an accelerated weathering test, the specimens are exposed to cycles of different atmospheric factors such as light, dark, water spray, temperature change and varying humidity in a specific test chamber, such as a weather-o — meter. Unlike light fastness, where only the degree of discoloration is measured, weather fastness involves more descriptive reporting. In addition to discoloration, defects such as degree of chalking and loss of gloss are reported. However, it should be noted that artificial accelerated test data may not represent actual outdoor conditions. Also, natural weathering tests have some limitations, as weather cannot be standardized.
Further information can be found in standard methods such as EN ISO 11341.
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