Perfluoroelastomer (FFKM)
Perfluoroelastomer (FFKM) provides the ultimate in performance regarding heat and chemical resistance, but is very expensive. Some grades are suitable for continuous use at 327°C, with chemical resistance being almost universal.
Typical applications
- Semiconductor
- Chemical
- Petroleum
- ‘O’ Ring applications
Advantages
Disadvantages
Properties
Resistance
Advantages
- Exceptional heat and chemical resistance
- Thermal stability from -25°C to 325°C
- Ultimate in sealing performance
Disadvantages
- Moderate mechanical properties deteriorate rapidly at elevated temperatures and at temperatures below 0°C
- Poor compression set
- Can be difficult to process
- Limited colour range
Properties
| Hardness Range | 60 – 95 |
| Heat Resistance | |
| Maximum Continuous | 300°C |
| Maximum Intermittent | 325°C |
| Low Temperature Resistance | -25°C |
Resistance
| Resistances | |
| Oxidation | Excellent |
| Ozone & Weathering | Excellent |
| Oil Resistance | |
| ASTM Oil No.1 @ 20°C | Excellent |
| ASTM Oil No.1 @ 100°C | Good |
| ASTM Oil No. 3 @20°C | Excellent |
| ASTM Oil No. 3 @ 100°C | Good |
| Fuel Resistance | |
| ASTM Fuel @ 40°C | Excellent |
| Solvent Resistance | |
| Alcohol @20°C | Outstanding |
| Acetone @20°C | Outstanding |
| Benzene @20°C | Outstanding |
| Chemical Resistance | |
| Acids | Outstanding |
| Bases | Outstanding |
| Physical Strength | Poor (at high temp) |
| Compression set | Fair |
| Tear & Abrasion Resistance | Poor |
| Resilience | Fair |
| Permeability to Gases | Fairly Low |
| Electrical strength | Good |
| Flame Resistance | Self-extinguishing |
| Water Resistance | Good |
