FKM 5 - Fluoroelastomer pentamer containing tetrafluoroethylene & fluorinated vinyl ether
| Clwyd reference | FKM 5 |
| ASTM classification | FKM 5 |
Pentapolymer of tetrafluoroethylene (TFE), hexafluoropropylene (HFP), ethylene (E), a fluorinated vinyl ether (PMVE) and vinylidene fluoride (VF2/VDF). Type 5 FKM is known for base resistance and high temperature hydrogen sulfide resistance. | |
| Typical applications | |
| Advantages | |
| Disadvantages | |
| Available hardness range (Shore A) | 60 - 95 |
| Upper continuous service temp. | 250°C |
| Min. temp. for sealing applications | -10°C |
| Minimum non-brittle temp. | -15°C |
| Tensile strength (up to) | 20 MPa |
| Elongation at break (up to) | 250% |
| 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 | Excellent |
| Acid (weak) | Excellent |
| Acid (strong) | Good |
| Base (weak) | Excellent |
| Base (strong) | Good |
| Hydrogen sulphide | Good |
| Steam | Excellent |
| Ozone | Excellent |
| Radiation | Excellent |