# Material 41B8 (EPDM) — O-rings | Oringaero Source: https://oringaero.fr/en/matieres/41B8.html [All materials](https://oringaero.fr/en/matieres.html) / 41B8 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 | ## Your need in 41B8 Specify your drawing, quantities and service conditions. [Request a quote](https://oringaero.fr/en/devis.html?matiere=41B8) · [Download the data sheet (PDF)](https://oringaero.fr/fiches/Material_data_sheet_41B8_Oringaero.pdf)[Storage conditions →](https://oringaero.fr/en/normes.html#stockage) ## 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. - [OA-41B8-4.2X1.9](https://oringaero.fr/en/produits/41b8-4-2x1-9.html)4.2 × 1.9 mm - [OA-41B8-5.28X1.78](https://oringaero.fr/en/produits/41b8-5-28x1-78.html)5.28 × 1.78 mm - [OA-41B8-5.7X1.9](https://oringaero.fr/en/produits/41b8-5-7x1-9.html)5.7 × 1.9 mm - [OA-41B8-6.4X1.9](https://oringaero.fr/en/produits/41b8-6-4x1-9.html)6.4 × 1.9 mm - [OA-41B8-6.86X1.78](https://oringaero.fr/en/produits/41b8-6-86x1-78.html)6.86 × 1.78 mm - [OA-41B8-8.9X1.9](https://oringaero.fr/en/produits/41b8-8-9x1-9.html)8.9 × 1.9 mm - [OA-41B8-9.25X1.78](https://oringaero.fr/en/produits/41b8-9-25x1-78.html)9.25 × 1.78 mm - [OA-41B8-10.5X2.7](https://oringaero.fr/en/produits/41b8-10-5x2-7.html)10.5 × 2.7 mm - [OA-41B8-12.5X2](https://oringaero.fr/en/produits/41b8-12-5x2.html)12.5 × 2 mm - [OA-41B8-13.94X2.62](https://oringaero.fr/en/produits/41b8-13-94x2-62.html)13.94 × 2.62 mm - [OA-41B8-14X1.78](https://oringaero.fr/en/produits/41b8-14x1-78.html)14 × 1.78 mm - [OA-41B8-16.9X2.7](https://oringaero.fr/en/produits/41b8-16-9x2-7.html)16.9 × 2.7 mm - [OA-41B8-17.17X1.78](https://oringaero.fr/en/produits/41b8-17-17x1-78.html)17.17 × 1.78 mm - [OA-41B8-18.3X3.6](https://oringaero.fr/en/produits/41b8-18-3x3-6.html)18.3 × 3.6 mm - [OA-41B8-18.72X2.62](https://oringaero.fr/en/produits/41b8-18-72x2-62.html)18.72 × 2.62 mm - [OA-41B8-20X3](https://oringaero.fr/en/produits/41b8-20x3.html)20 × 3 mm - [OA-41B8-20.35X1.78](https://oringaero.fr/en/produits/41b8-20-35x1-78.html)20.35 × 1.78 mm - [OA-41B8-23.52X1.78](https://oringaero.fr/en/produits/41b8-23-52x1-78.html)23.52 × 1.78 mm - [OA-41B8-26.64X2.62](https://oringaero.fr/en/produits/41b8-26-64x2-62.html)26.64 × 2.62 mm - [OA-41B8-26.7X1.78](https://oringaero.fr/en/produits/41b8-26-7x1-78.html)26.7 × 1.78 mm - [OA-41B8-27.8X3.6](https://oringaero.fr/en/produits/41b8-27-8x3-6.html)27.8 × 3.6 mm - [OA-41B8-28.3X1.78](https://oringaero.fr/en/produits/41b8-28-3x1-78.html)28.3 × 1.78 mm - [OA-41B8-30X2](https://oringaero.fr/en/produits/41b8-30x2.html)30 × 2 mm - [OA-41B8-31.47X1.78](https://oringaero.fr/en/produits/41b8-31-47x1-78.html)31.47 × 1.78 mm [View all 45 O-rings in 41B8 in the catalogue →](https://oringaero.fr/en/catalogue.html?mat=41B8) [All catalogue sizes in 41B8](https://oringaero.fr/en/catalogue/41b8-1.html)