Sealing systems
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PTFE-25% Carbon
(T125-C25, Ecoflon 4)
A polytetrafluoroethylene plastomer with a graphite filler for self-sealing, slip, pressure and support rings, self-sealing chevron rings and guide rings. Very good slip properties.
| Norm | Unit | Value | |
|---|---|---|---|
| Density | DIN 53479 | g/cm³ | 2,05-2,11 |
| Hardness | ASTM D2240 | Shore D | 62-67 |
| Yield strength | ASTM D4894 | N/mm² | 14-18 |
| Elongation at break | ASTM D4894 | % | 70-120 |
| Coefficient of friction (dyn) | ASTM D1894 | mi | 0,11 |
| Minimum operation temperature | °C | -200 | |
| Maximum operation temperature | °C | +260 | |
| Grindability index (K) | ASTM D3702 |
cm³min 10ˉ.../kgml |
16-20 |
| Comp. resistance. at 1% deform. | ASTM D695... | N/mm² | 7-9 |
| Coefficient of thermal expansion (lin) 25-100 °C | ASTM D695... | 10ˉ.../°C | 10-12 |
