The test cycle is too long if the natural environment is used to evaluate materials durability. The evaluation test can not meet the requirements of design, testing, setting in short term very well.
若通过自然环境试验考核涂层材料的耐候性，则试验周期太长，在很多时候不能很好满足设备在短期内完成设计、试验、定型的要求。
Currently, 3 test methods, including the natural environmental testing, the natural accelerated testing and the laboratory accelerated testing, are used to evaluate materials durability.
目前，评价材料耐候性的试验技术主要有自然环境试验、自然环境加速试验和实验室加速试验3种方法。
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