结果表明金属活性助剂mca，在不同的硫化体系中可提高丁腈橡胶的拉伸强度、硬度，改善丁腈橡胶的耐热老化性能及压缩永久变形性能。
The results have shown that MCA can increase tensile strength and hardness of NBR and also improve the properties of resistance to heat aging and compression set of NBR as well.
密封介质使橡胶溶胀，降低了橡胶的硬度，由此油封的过早的老化和磨损；
The sealed media that rubber, and to reduce the swelling of the rubber oil seal, and, as a result, the hardness premature aging and wear;
对试样进行了硬度、拉伸强度、断裂伸长率、热老化等性能试验；对老化后的试样表面进行了SEM表征。
Hardness, tensile strength, breaking elongation ratio and aging property of samples were tested and surface of sample after aging was represented by SEM.
如果需要，一些合金还可以提供成形后热处理(老化硬化)至更高硬度和强度的能力。
Where required, some of the alloys also offer post form, heat treatment (age hardening) capabilities for even higher hardness and strength levels.
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.
当AAEM的质量分数为4%，其金属闪光涂料的固化漆膜具有高金属闪光指数、高抗冲、高硬度、良好的耐水、 耐盐雾及耐老化等性能。
When the contents of AAEM was 4%(wt%), the cured metallic coating film had high metal flash index, high-impact strength, high-hardness, good salt spray…
添加黑液干粉的复合材料，在热氧老化后拉伸强度和邵尔A型硬度增加，断裂伸长率稍有下降。
In general, the tensile strength and Shore A hardness of PVC/CPE/black liquor powder composites were increased while the elongation at break was slightly decreased after thermo-oxidative aged.
添加黑液干粉的复合材料，在热氧老化后拉伸强度和邵尔A型硬度增加，断裂伸长率稍有下降。
In general, the tensile strength and Shore A hardness of PVC/CPE/black liquor powder composites were increased while the elongation at break was slightly decreased after thermo-oxidative aged.
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