• Compressive Deformation :

The compressive creep behaviour of filled PTFE is one of the most significant properties to the designer and user. In comparison with unfilled PTFE the compressive modulus of filled PTFE is greater and hence, for the same stress, a lower deformation will occur. This difference diminishes, however, as temperatures rise and the compressive performance of unfilled and filled PTFE draws close together at 200°C(392°F). The reason is almost certainly that the general reduction in the compressive modulus of the PTFE matrix overrides the support given by the random distribution of filler particles.