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Why the energy saving lamp plastic in the light of a period of time will become yellow?

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Plastic yellow is a fundamental property of the plastic, plastic yellow reason a lot, but the most important one of the reasons is the effects of ultraviolet radiation, PBT materials is no exception, because in the process of lighting, lamp will produce ultraviolet light, ultraviolet radiation plastic make it turn yellow, of course, we in the plastic can some anti ultraviolet material into, but this only prolong it becomes yellow time, a long time, it is yellow. But plastic does not affect the plastic and some basic characteristics such as high temperature resistance and flame retardant.