Ptfe has a - cold flow. That is, the plastic deformation (creep) of material products under continuous load for a long time, which brings some limitations to its application. For example, when PTFE is used as a gasket, the bolts are screwed so tightly that they exceed the specified compression stress, causing the gasket to cool (creep) and be flattened.
These shortcomings can be overcome by adding appropriate packing and improving the structure of parts.
PTFE has outstanding non-viscosity, which limits its industrial application. It is an excellent anti-adhesion material, which makes it very difficult to adhere to the surface of other objects.
PTFE's linear expansion coefficient is 10~20 times that of steel, which is larger than most plastics. PTFE's linear expansion coefficient changes irregularly with the change of temperature. When applying PTFE, it's easy to lose out if you don't pay enough attention to this aspect of performance.
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