PTFE – polytetrafluorethylene (Teflon)
PTFE is known by its incredible good chemical resistance. Although PTFE has a very low friction, wear resistance and mechanical strength is limited. These qualities can be improved by adding for example fiberglass or charcoal. As semi-finished the most used manufacturing method is pressing / sintering. Besides pure PTFE in bars, hollow bars and sheets in white color, it can be delivered with an addition of glass, graphite, bronze or similar.
Application
PTFE is often used, where the need is good chemical resistance or high temperature resistance. Even longer stays in hot water or sunlight does not impair the material’s characteristics. PTFE is particularly used within the chemical industry and the electronic industry.
- Packings
- Seals
- Pump parts
Qualities
Although PTFE has a low friction, it is not recommended to use the material as slide plate or bearings material, where there are too high a risk of cold flow.
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We stock PTFE in bars, hollow bars and sheets. PTFE with glass and other additives can be obtained from the plant.
| PTFE + 20% glass | PTFE | |
|---|---|---|
| Density, g/cm³ | 2,24 | 2,20 |
| Ball pressure hardness, N/mm² | 27 | 22 |
| Tensile strength, MPa | 11 | 10-25 |
| Modules of elasticity, MPa | n/a | 750 |
| Toughness, KJ/m² | n/a | 16 |
| Moisture absorption 50%RF, % | 0,015 | >0,01 |
| Application temperature, 0C | -200/+260 | -200/+260 |
| Coefficient of expansion, 10-5/0C | 8,2 – 10,7 | 12,5-19 |
| Friction, µ | 0,3 | 0,1 |
| Acid (diluted) | + | + |
| Base | + | + |
| Solvent | + | + |
| UV-light | + | + |
+ = useful
– = non useful
