硬度增大，而拉伸强度和扯断伸长率则逐渐降低，随老化时间延长，变化趋势逐渐平缓。

The hardness gradually increased, while the tensile strength and elongation at break decreased gradually. With the elongation of time, these change gradually flattened.

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硬度增大，而拉伸强度和扯断伸长率则逐渐降低，随老化时间延长，变化趋势逐渐平缓。

The hardness gradually increased, while the tensile strength and elongation at break decreased gradually. With the elongation of time, these change gradually flattened.

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