Press molding method (paste extrusion), also known as paste extrusion method, referred to as push method. The method of making polytetrafluoroethylene products by plunger extrusion. The polytetrafluoroethylene dispersion resin and the auxiliary petroleum ether (ratio of about 5: 1) are uniformly mixed and molded into a parison. Then, the parison is placed in a press machine and is molded by pushing the plunger. Since the auxiliary agent is dispersed in the resin into a paste, has a lubricating effect, by pressing the shear effect of the spherical resin particles can be stretched into a fibrous structure. Push method can be formed tube, bar, the two rollers after rolling into thin strip, extraction of additives to get raw material belt, is a good corrosion-resistant sealing material.