Photochemical aging tests, accelerated

These findings clearly illustrate how the results of so-called "accelerated-aging" tests can be affected by the high temperatures in ordinary xenon- and carbon-arc equipment and can, therefore, lead to erroneous conclusions regarding the photochemical behavior of materials at near-normal temperatures (23). 

It is important to predict the aging effects of photochemical exposure on properties of materials before their use in different applications. In many applications, mostly ones occurring in the natural environment, exposure to UV irradiation must be taken into account at certain elevated test temperatures as means of accelerated... 

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