- Stress build up in material due to tool hardness
- Deformation of material due to heat from machining
- Burrs forming on part which may need to be manually removed, affecting tolerance
- Virgin PTFE
- PTFE+15% Glass
- PTFE+40% Bronze
Additionally, all three grades reverted to within 0.01mm of their original dimensions when left overnight to warm under room temperature. This suggests that the dimensional change is linked purely to the ambient temperature and that there is no observable stress build-up in the material due to the cold which causes it's original dimension to alter permanently (at least, not in the range of -15 to +30 degrees Celsius).