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选择耐高温的高分子材料———聚酰亚胺作为浸渍密封剂，采用二次真空、加压浸渍工艺和适当的固化方法，既能使聚酰胺酸有效地浸渍石墨环，又能使固化后得到的聚酰亚胺具有最佳耐高温性（在４５０℃没有明显的热解现象）。实验结果表明：采用本文方法浸渍密封的石墨环，其孔隙的６０％被密封；在１０ＭＰａ的压力下具气密性；该石墨环可在３００℃的高温下工作；可耐水、酸、碱和绝大多数有机溶剂。
Select high temperature resistant polymer material --- polyimide as impregnating sealant, using secondary vacuum, pressure impregnation process and proper curing method, which not only make polyamic acid effectively impregnated graphite ring, but also make the curing The resulting polyimide had the best high temperature resistance (no obvious pyrolysis at 450 ° C). The experimental results show that 60% of the pores of the graphite ring impregnated by this method are sealed, and the gas ring is hermetically sealed under the pressure of 1.0 MPa. The graphite ring can work under high temperature of 300 DEG C, Alkali and most organic solvents.