选用碳素纤维填料和膨胀石墨填料混合使用，密封效果良好。
Two kinds of packing: i. e. carbon with fiber and soft graphite are used. The sealing effect is excellent for high pressure boiler F. W. P.
膨胀石墨填料环的回弹性和结构将不会被化学介质所侵蚀。能提供有效的密封作用，并无任何螺栓扭矩损失。
The resiliency and structure of expanded graphite molded packing are not affected by chemical attack, consequently it provides effective seal without any torque loss.
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