Even with its outstanding properties, virgin PTFE can be improved for specific engineering uses. Mechanical applications especially often require improved physical characteristics.
A proper combination of fillers, components added in the polymer matrix, will further enhance the following factors:
- Creep resistance
- wear resistance
- thermal conductivity
- arc resistance
- dimensional stability
As a general rule, most properties, and especially tensile strength, drop sharply with the percentage of the incorporated filler.
This has to be carefully calculated before choosing the right compound for its correct application.
Where parts need to retain a degree of elasticity, the compound used will generally be low on filler. Whenever there is a problem of friction under load, a high filler content should be used.
Common fillers are
- 15% Glass Fiber (GF)
- 25% Glass Fiber (GF)
- 15% Graphite (GR)
- 25% Carbon (CAR)
- 40% Bronze (BR)
- 60% Bronze (BR)
For specific applications where standard fillers don’t fulfill the mandatory performance, other grades can be processed upon request. Specific compounds can be chosen from a wide range of mineral, inorganic, organic or metallic fillers. Predicting the impact of such fillers. The shape, the size and the reparation of such components within the PTFE matrix highly impact the performance between similar compounds.
Therefore, a strong knowledge of fillers and the high-scale production of such compounds are the most important know-how to answer specific developments.