Materials technology: ECO [epichlorohydrin], EPDM [ethylene propylene] and FFKM [fully-flourinated perfluoroelastomer]
At DP Seals we pride ourselves on being able to provide specialist advice in selecting and developing exactly the right blend of materials to meet a vast range of performance requirements.
This information is only a guide to the more common materials, their primary characteristics and uses. The relationship between material, product performance and blend options is complex.
| Material | Fully-fluorinated FKM | Ethylene Propylene | Epichlorohydrin |
| Description | Tough! Temperature performance beyond most elastimers, highly resistant to a wide range of solvents and chemicals, low permeation and outgassing. | Excellent weather and ozone resistance. High tensile strength. Good low temperature properties. Resistant to non-flammable hydraulic fluids (Skydrol) but poor resistance to mineral oils. | Good low temperature flexibility and gas permeability with high resistance to oils, fuels and common solvents; good weatherability. |
| Cost | £££££ | ££ | ££ |
| Hardness: Shore A (Hint) | 40-90 | 40 - 90 | 35 - 90 |
| Tensile Strength (1000psi) | 3 | 0.5 - 3.5 | 2 - 3 |
| Tear Resistance | Good | Fair | Good |
| Impact Resistance | Excellent | Good | Good |
| Compression Set (Method B, %) | <20 | 20 - 60 | 20 |
| Electrical Resistance (Ω/cm2 | 1*1012 | 2*1016 | 1*1012 - 1*1013 |
| Low Temperature (°C) | -15 | -45 | -50 |
| High Temperature (°C) | 275 | 130 | 140 |
| intermittent High (°C) | 315 | 150 | 150 |
| Ozone (protected) | Excellent | Excellent | Excellent |
| Weather and Sunlight | Excellent | Excellent | Excellent |
| Gas Permeation | Excellent | Good | Fair |
| Water | Excellent | Excellent | Good |
| Acid/Base - Dilute | Excellent | Excellent | Good |
| Acid/Base Concentrated | Excellent | Fair | Fair |
| Solvent - Aliphatic | Excellent | Poor | Excellent |
| Solvent - Aromatic | Excellent | Poor | Good |
| Oils and Gasoline | Excellent | Poor | Excellent |
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