Materials technologies: FKM [fluoroelastomer (Viton®)], FVMQ [fluorosilicone] and HNBR [hydrogenated nitrile
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 | FluoroSilicone | Hydrogenated Nitrile | Fluoroelastomer (Viton) |
| Description | Combines the high and low temperature advantages of silicone rubber with resistance to many harsh chemicals for use in the most demanding applications. | Outstanding physical properties combined with good mechanical properties at elevated temperature and excellent resistance to many chemically aggressive technical oils. | Excellent long term heat resistance and ageing. Excellent hot oil, aliphatic and aromatic hydrocarbon resistance. Not very elastic. High cost polymer. |
| Cost | ££££ | ££££ | £££ |
| Hardness: Shore A (Hint) | 40-80 | 50 - 90 | 40 - 90 |
| Tensile Strength (1000psi) | 2.0 | 3.5+ | 2.0 |
| Tear Resistance | Fair | Fair | Good |
| Impact Resistance | Fair | Good | Good |
| Compression Set (Method B, %) | 30 - 50 | 5 - 20 | 5 - 20 |
| Electrical Resistance (Ω/cm2 | 1*1013 - 1*1014 | 2*1011 | 2*1013 |
| Low Temperature (°C) | -60 | -20 | -15 |
| High Temperature (°C) | 200 | 150 | 250 |
| intermittent High (°C) | 225 | 165 | 300 |
| Ozone (protected) | Excellent | Good | Excellent |
| Weather and Sunlight | Excellent | Good | Excellent |
| Gas Permeation | Fair | Fair | Excellent |
| Water | Excellent | Fair | Good |
| Acid/Base - Dilute | Excellent | Good | Excellent |
| Acid/Base Concentrated | Fair | Fair | Excellent |
| Solvent - Aliphatic | Good | Excellent | Excellent |
| Solvent - Aromatic | Fair | Fair | Excellent |
| Oils and Gasoline | Fair | Excellent | Excellent |
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