EPDM
Material 41B8
Phosphate-ester hydraulic fluids.
Properties
| Family | EPDM |
|---|---|
| Standard | NF L 17-241 |
| Nominal hardness | 80 Shore A |
| Measured IRHD hardness | 79 |
| Continuous service temperature | −55 to +100 °C |
| Short-term temperature | −55 to +150 °C |
| Storage group | III |
Properties measured at qualification
Qualification tests of compound 41B8 to NF L 17-241, carried out by an independent test laboratory. “—”: measured value with no requirement in the standard.
| Property | Requirement | Measured |
|---|---|---|
| Initial state | ||
| Hardness IRHD (°) | 76 to 85 | 79 |
| Hardness Shore A (points) | 80 | 80 |
| Tensile strength (MPa) | ≥12 | 19.2 |
| Elongation at break (%) | ≥125 | 151 |
| Modulus at 100 % (MPa) | — | 11.4 |
| Tear strength (kN/m) | — | 20 |
| Density (Mg/m³) | ±0.02 between deliveries | 1.17 |
| Immersion in tri-n-butylphosphate — 22 h at 100 °C | ||
| Change in IRHD hardness (°) | -15 to 0 | -15 |
| Max. change in tensile strength (%) | -15 | -12.5 |
| Max. change in elongation at break (%) | -20 | -4.6 |
| Change in volume (%) | 0 to +20 | 11.9 |
| Heat ageing — 70 h at 150 °C in air | ||
| Change in IRHD hardness (°) | 0 to +10 | 5 |
| Max. change in tensile strength (%) | ≥-25 | 3.6 |
| Max. change in elongation at break (%) | ≥-15 | -0.7 |
| Compression set | ||
| After 70 h at 100 °C in air (%) | ≤15 | 3.9 |
| Temperature retraction (TR) | ||
| Initial state — TR 10 (°C) | ≤-45 | -45 |
| After 22 h at 100 °C in tri-n-butylphosphate — TR 10 (°C) | ≤-45 | -51 |
O-rings in this material in the catalogue
45 references · sorted by inside diameter.