PV limits for PTFE approach zero at temperatures between 550F and 600 F. Useful PV limits must take into account the composition’s wear characteristics and allowable wear for the application. When considering PTFE for dry lubrication, low friction, you must consider ‘creep’ or ‘cold flow’. Generally, a plastic material subjected to continuous load experiences a continued deformation with time called creep or cold flow. Deformation can be significant, even at room temperature or below; hence, the name ‘cold flow’.
Creep is defined as the total deformation under stress after a specified time in a given environment beyond that instantaneous strain which occurs immediately upon loading. Independent variables affecting creep are time under load, temperature, and load or stress level.So long as the stress level is below the elastic limit of the material, performance is sustainable. And beyond a certain point, creep is small and may be neglected for many applications. In many cases, too, there is compressive recovery from various percentages of strain. Nearly complete where the original strain does not exceed the yield strain.
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