NBR
Material 20A8
Mineral-based or synthetic-hydrocarbon hydraulic fluids.
Properties
| Family | NBR |
|---|---|
| Standard | NF L 17-120 |
| Nominal hardness | 80 Shore A |
| Measured IRHD hardness | 79 |
| Continuous service temperature | −30 to +120 °C |
| Short-term temperature | −30 to +140 °C |
| Storage group | II |
Properties measured at qualification
Qualification tests of compound 20A8 to NF L 17-120, carried out by an independent test laboratory. “—”: measured value with no requirement in the standard.
| Property | Requirement | Measured |
|---|---|---|
| Initial state | ||
| Hardness IRHD (°) | 73-82 | 79 |
| Hardness Shore A (points) | 80±5 | 80 |
| Tensile strength (MPa) | ≥14 | 18.3 |
| Elongation at break (%) | ≥200 | 225 |
| Modulus at 100 % elongation (MPa) | — | 9.7 |
| Tear strength (kN/m) | — | 35 |
| Density (Mg/m³) | — | 1.29 |
| Immersion in hydraulic fluid AIR 3520 — 70 h at 125 °C | ||
| Change in hardness (°) | -10 to 0 | -6 |
| Max. change in tensile strength (%) | -30 | 2.7 |
| Max. change in elongation (%) | -50 | -30.7 |
| Change in volume (%) | 0 to +8 | 4.9 |
| Immersion in hydraulic fluid AIR 3520 — 48 h at 100 °C | ||
| Change in volume (%) | 0 to +6 | 4.6 |
| Heat ageing — 70 h at 125 °C in air | ||
| Change in IRHD hardness (°) | 0 to +12 | 6 |
| Max. change in tensile strength (%) | -10 | 7.7 |
| Max. change in elongation (%) | -50 | -35.1 |
| Max. change in mass (%) | -8 | -2.5 |
| Compression set | ||
| After 70 h at 125 °C in air (%) | ≤40 | 29.3 |
| After 22 h at 100 °C in air (%) | ≤20 | 13.8 |
O-rings in this material in the catalogue
1482 references · sorted by inside diameter.