老化系数，即材料老化后的性能的变化率，反映材料发生老化的程度。老化系数的计算通常采用老化后材料的性能指标与老化前材料性能指标的比值来得到。
冬季来临，轮胎容易老化，与路面的摩擦系数降低，出现抓地不稳的状况。
Winter, tire easily aging, lower coefficient of friction with the road surface, the situation appears unstable grip.
用压缩应力松弛系数作为老化性能变化指标，得出了性能随老化时间和温度变化的动力学曲线。
The kinetic curves properties response aging time and temperature were obtained with the coefficient of compression stress relaxation as index of aging property change.
在已知的塑料中，四氟具有最好的耐腐蚀性，不老化，油封低磨擦系数，耐磨擦。
It has the best chemical corrosion resistance among known plastics. Without being aging, lowest friction coefficient, wear resistance.
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