1. Polytetrafluoroethylene (PTFE) has a "cold flow" property. That is to say, the plastic deformation (creep) of material products under long-term continuous load brings certain restrictions to its application. For example, when PTFE is used as a gasket, the bolt is tightly tightened to seal tightly, so that it exceeds the specific compressive stress, the gasket will produce "cold flow" (creep) and be flattened. These shortcomings can be overcome by adding appropriate fillers and improving the structure of parts.
　　
　　2. PTFE has outstanding non-stickiness, which limits its industrial application. It is an excellent anti-sticking material, which makes it extremely difficult to bond with the surface of other objects.
　　
　　3. The linear expansion coefficient of PTFE is 10-20 times that of steel, which is larger than that of most plastics. The linear expansion coefficient of PTFE varies irregularly with the change of temperature. In the application of PTFE, if the performance of PTFE is not paid enough attention, it is easy to cause losses.
　　
　　Polytetrafluoroethylene O-ring Uses:
　　
　　Doors and windows, automobiles, decoration, spraying, machinery, electrical appliances, bearings, pumps, cylinders, idlers, water pipes, chemical pipes, valves