The combined effects of factors such as solar radiation, atmospheric gases, changes in temperature and humidity are collectively referred to as "atmospheric erosion," which causes most organic materials to age and eventually damage. Many organic materials can work normally in temperate regions, but they are completely unsuitable for use in harsh tropical areas. Such as the rapid deterioration and decomposition of coatings, the cracking and disintegration of cable jackets, and the discoloration of pigments.
The damage of various materials under atmospheric erosion is generally not caused by a single factor, but a comprehensive result of the interaction of several different types of characteristic factors. Although solar radiation is mainly ultraviolet radiation, in practice, it is difficult to separate its effects from its climate erosion factors. For example, although the effect of ultraviolet radiation on polyvinyl chloride alone is not obvious, the thermal destruction effect is significantly enhanced due to the main role of oxygen.
The xenon lamp test chamber occasionally has abnormal damage phenomena that are inconsistent with the natural atmospheric erosion. It can be attributed to one or more of the following reasons:
1) The ultraviolet light source used in many laboratories is very different from the natural spectrum;
2) In the accelerated test, when the factors such as ultraviolet radiation intensity and temperature and humidity are strengthened, their various reaction speeds under normal exposure conditions do not necessarily increase to the same degree.
3) Xenon lamp test chambers usually do not simulate all natural weather erosion factors.
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