Sealing systems
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PTFE
(T101-W, Teflon /Du Pont/, Ecoflon 1)
A polytetrafluoroethylene plastomer for support rings, chevron rings and guide small-load rings, O-rings, corrugated sealing rings and flat rings. It is a material with a broad range of application. Only molten metals of alkali soils and gaseous fluorine attack chemically PTFE, in the presence of high pressures and temperatures. PTFE begins to creep even under small load.
| Norm | Unit | Value | |
|---|---|---|---|
| Density | DIN 53479 | g/cm³ | 2,14-2,18 |
| Hardness | ASTM D2240 | Shore D | 51-65 |
| Yield strength | DIN 53455 | N/mm² | 25-31 |
| Elongation at break | DIN 53455 | % | 300-400 |
| Hardness sphere H 358/3 | DIN 53456 | N/mm² | 22-32 |
| Coefficient of friction (dyn) | ASTM D 1894 | mi | 0,06 |
| Minimum operation temperature | °C | -200 | |
| Maximum operation temperature | °C | +260 | |
| Grindability index (K) | ASTM D3702 |
cm³min 10ˉ.../kgml |
29.000 |
| Comp. resistance. at 1% deform. | ASTM D695... | N/mm² | 4-5 |
| Coefficient of thermal expansion (lin) 25-100 °C | ASTM D69... | 10ˉ.../°C | 12-13 |
