塑料老化的原因主要是由于结构或组分内部具有易引起老化的弱点，如具有不饱和双键、支链、羰基、末端上的羟基，等等。外界或环境因素主要是阳光、氧气、臭氧、热、水、机械应力、高能辐射、电、工业气体（如二氧化碳、硫化氢等）、海水、盐雾、霉菌、细菌、昆虫等等。
认为太阳光是影响塑料老化的主要原因，塑料包装箱不宜在户外无遮避贮存。
It was considered that the main cause of plastics weathering was sun's rays, and that plastics packaging box should not be stored without any cover in outdoor.
木质素对塑料的力学性能、老化性能、热稳定性、热氧降解性能等都有不同程度的影响。
Lignin has influences at different extents on mechanical properties, ageing property, thermostability and thermal degradation of plastics.
因此ABS塑料属于“湿度促进老化类型”。
ABS plastics are belong to the one of which humidity can accelerate the aging.
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