Abstract: This paper introduces the current status of sealing performance testing standards for commonly used nonmetallic gaskets at home and abroad. And a new type of low leakage sealing gasket with chemical resistance made by reinforced polytetrafluoroethylene was tested for leakage rate through simulation of flange surface defects. The low leakage sealing performance of this type of gasket for pipe flange systems was verified. The above test resultsshow thatthe new reinforced polytetrafluoroethylene sealing gasket can provide a sealing option for plant pipework with a higher level of safety and in more severe operating conditions.

Key words: sealing performance, low leakage, flange defect, reinforced polytetrafluoroethylene, gasket