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●一定的塑性，在压缩力的作用下可以产生一定的径向力并与阀杆紧密接触。
●足够的化学稳定性。它不会污染介质，填料不会被介质膨胀，填料中的浸渍剂不会被介质溶解，填料本身也不会腐蚀密封表面。
●自润滑性能好，耐磨性好，摩擦系数小。
●当偏心杆少量时，盘根应足够使弹性浮子。
●制造简单，装载方便。
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