Properties of unfilled PTFE
Special Characteristics
This material is characterized by a concentration of outstanding properties which is unique in the family of
plastics:
- An exceptionally wide thermal application range from -260°C up to +260°C (short-term up to 300°C)
- Virtually universal chemical resistance
- Light and weather resistance
- Hot water vapor resistance
- Very good sliding properties
- Anti-adhesive behavior
- Non-combustible ; LOI > 95
- Good electric and dielectric properties
- No absorption of water
- Physiologically harmless (BgVV,
EU and FDA approvals for use with foodstuffs)
Benefits of Modified PTFE
While retaining the positive properties that are typical for PTFE, modified PTFE has additional benefits:
- Cold flow reduced by the factor of 3
- Reduced permeation of chemicals and gases down to half of the PTFE value
- Porosity reduced to half of PTFE's porosity
- Minimum tendency for pore formation during drawing processes
- Suitable for welding, using spezial methods
Shortcomings
Besides these benefits, unfilled PTFE has a few shortcomings as well:
- Cold flow behavior
- Relatively low wear resistance
- Low resistance to high-energy radiation
- Poor adhesion behavior of PTFE
- PTFE is not suitable for injection or welding processes
|
|
|
|
|
