Die molding Fluorine plastic molding can be processed plate, rod, sleeve, tape, sealing ring, diaphragm and metal insert parts. The molding is divided into three steps: preforming, sintering and cooling. There are two methods of cold pressing and hot pressing. Preforming is the fluorine plastic powder (currently PTFE) evenly added to the mold, at room temperature pressure into dense preforming products (that is, rough); Sintering is the process of heating the preformed product above the melting point, and cooling is the process of lowering the sintering temperature to room temperature.