FKM 1 - Fluoroelastomer copolymer
| Clwyd reference | FKM 1 |
| ASTM classification | FKM 1 |
Dipolymer (or copolymer) of hexafluoropropylene (HFP) and vinylidene fluoride (VF2/VDF). Copolymers are the standard type of FKMs showing a good all round performance in both chemicals and heat The fluorine content typically is 66 weight percent. | |
| Typical applications | |
| Advantages | |
| Disadvantages | |
| Available hardness range (Shore A) | 50 - 95 |
| Upper continuous service temp. | 240°C |
| Min. temp. for sealing applications | -15°C |
| Minimum non-brittle temp. | -20°C |
| Tensile strength (up to) | 20 MPa |
| Elongation at break (up to) | 300% |
| Price Bracket | Low |
| ASTM 1 Oil | Excellent |
| ASTM 2 Oil | Excellent |
| ASTM 3 Oil | Excellent |
| Kerosene | Excellent |
| Liquid B | Excellent |
| Liquid 101 | Excellent |
| Phosphate ester | None |
| Ketone | None |
| Toluene | Excellent |
| Iso-octane | Excellent |
| Methanol | None |
| Acid (weak) | Good |
| Acid (strong) | Average |
| Base (weak) | None |
| Base (strong) | None |
| Hydrogen sulphide | None |
| Steam | None |
| Ozone | Excellent |
| Radiation | Excellent |