Aiming at the problem, compares and selects the properties of such four materials as oil-immersed asbestos packing, flexble graphite, oil-proofrubber and polytetrafluoroethylene.

• 针对这一问题,对油浸石棉盘根、柔性石墨、耐油橡胶、聚四氟乙烯材料的性能进行了对比和选择。