FKM 3 - Fluoroelastomer terpolymer containing fluorinated vinyl ether
| Clwyd reference | FKM 3 |
| ASTM classification | FKM 3 |
Terpolymer of tetrafluoroethylene (TFE), a fluorinated vinyl ether (PMVE), and vinylidene fluoride (VF2/VDF). The addition of PMVE provides better low temperature flexibility compared to copolymers and terpolymers. Typically the fluorine content of type 3 FKMs ranges from 62 to 68 weight percent. | |
| Typical applications | |
| Advantages | |
| Disadvantages | |
| Available hardness range (Shore A) | 60 - 95 |
| Upper continuous service temp. | 250°C |
| Min. temp. for sealing applications | -25°C |
| Minimum non-brittle temp. | -40°C |
| Tensile strength (up to) | 20 MPa |
| Elongation at break (up to) | 300% |
| Price Bracket | High |
| ASTM 1 Oil | Excellent |
| ASTM 2 Oil | Excellent |
| ASTM 3 Oil | Excellent |
| Kerosene | Excellent |
| Liquid B | Excellent |
| Liquid 101 | Excellent |
| Phosphate ester | None |
| Ketone | Average |
| Toluene | Excellent |
| Iso-octane | Excellent |
| Methanol | Good |
| Acid (weak) | Excellent |
| Acid (strong) | Average |
| Base (weak) | None |
| Base (strong) | None |
| Hydrogen sulphide | None |
| Steam | Average |
| Ozone | Excellent |
| Radiation | Excellent |