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Composition: VDF, HFP, TFE, etc.
CAS: 25067-11-2
Appearance: Translucent solid
Fluoroelastomer (FKM) is a synthetic high‑molecular-weight elastomer with fluorine atoms on the main or side-chain carbon atoms. It exhibits exceptional heat, oil, and chemical resistance, with long-term service temperatures up to 200–250°C and short-term exposure tolerance above 300°C. FKM also provides excellent oil, solvent, acid/base, ozone resistance, and low compression set, widely used in automotive engines, oil drilling, chemical equipment, aerospace, and other extreme environments for seals, gaskets, and hose materials.
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Bisphenol-cured FKM is the most widely used curing system for fluoroelastomers. Its key advantage is extremely low compression set—seals maintain excellent rebound and prevent leakage even after long-term exposure to high temperature and pressure. Bisphenol-cured FKM also provides good processing safety, long scorch time, low scrap tendency, and easy demolding, with excellent resistance to fuels, mineral oils, and synthetic lubricants.
Typical Applications:
General engine oil seals, crankshaft seals, valve stem seals, bearing seals, transmission seals, fuel system O-rings, hydraulic seals, and other standard automotive and industrial sealing components
| Curing Type | Polymer Type | F% | S.G. | Mooney Viscosity | Tensile | Elongation | Compression set | TR10 |
| g/cm³ | ML1+10 @ 121℃ | Mpa | % | 200℃ *70hr | ℃ | |||
| Bisphenol curing | Copolymer | 66 | 1.81 | <20 | 12.10 | 210 | 18 | -17 |
| Copolymer | 66 | 1.81 | 20-40 | 13.00 | 190 | 18 | -17 | |
| Copolymer | 66 | 1.81 | 40-60 | 14.00 | 200 | 18 | -17 | |
| Copolymer | 66 | 1.81 | 60-100 | 15.00 | 190 | 18 | -17 | |
| Copolymer | 66 | 1.81 | >100 | 15.50 | 200 | 18 | -17 | |
| Copolymer | 66 | 1.81 | 10-100 | 13.00 | 220 | 20 | -17 | |
| Terpolymer | 65.5 | 1.80 | 10-100 | 13.00 | 220 | 25 | -20 | |
| Terpolymer | 68.5 | 1.84 | <40 | 13.50 | 240 | 20 | -14 | |
| Terpolymer | 68.5 | 1.84 | 40-60 | 15.00 | 220 | 21 | -14 | |
| Terpolymer | 68.5 | 1.84 | >60 | 17.00 | 220 | 21 | -14 | |
| Terpolymer | 69 | 1.87 | 10-100 | 15.00 | 223 | 21 | -13 | |
| Terpolymer | 69 | 1.87 | 10-100 | 13.50 | 230 | 22 | -13 | |
| Terpolymer | 70 | 1.90 | 10-100 | 15.00 | 260 | 35 | -7 |
Peroxide-cured FKM uses stable carbon–carbon crosslinks, providing high chemical inertness and resistance to acids, bases, amines, and steam. Its main advantages are excellent acid, amine, and steam resistance, suitable for long-term exposure to amine-containing high-performance engine oils, acidic gases, high-temperature steam, and oilfield chemicals. Peroxide-cured FKM also offers greater formulation flexibility, allowing incorporation of low-temperature monomers for improved low-temperature elasticity or co-curing with other peroxide-cured elastomers (e.g., silicone or acrylic rubbers).
Typical Applications: Turbocharger hoses, injector O-rings, acid-resistant seals, oilfield downhole tool seals, amine-containing lubricant system seals, high-temperature steam valve seals, pump seals, semiconductor manufacturing equipment seals
| Curing Type | Polymer Type | F% | S.G. | Mooney Viscosity | Tensile | Elongation | Compression set | TR10 |
| g/cm³ | ML1+10 @ 121℃ | Mpa | % | 200℃ *70hr | % | |||
| Peroxide curing | Terpolymer | 65.5 | 1.80 | 10-60 | 22.00 | 300 | 24 | -24 |
| Terpolymer | 68.5 | 1.85 | 10-60 | 25.00 | 240 | 23 | -14 | |
| Terpolymer | 68.5 | 1.85 | 10-60 | 25.00 | 240 | 23 | -14 | |
| Terpolymer | 70.0 | 1.90 | 10-60 | 25.00 | 240 | 22 | -7 | |
| Terpolymer | 65.5 | 1.80 | 10-60 | 22.00 | 300 | 24 | -24 | |
| Terpolymer | 68.5 | 1.85 | 10-60 | 25.00 | 240 | 23 | -14 | |
| Terpolymer | 70.0 | 1.90 | 10-60 | 25.00 | 240 | 22 | -7 | |
| Terpolymer | 65.5 | 1.80 | 10-60 | 23.00 | 300 | 16 | -24 | |
| Terpolymer | 68.5 | 1.85 | 10-60 | 25.00 | 250 | 15 | -14 | |
| Terpolymer | 70.0 | 1.90 | 10-60 | 25.00 | 240 | 14 | -7 | |
| Terpolymer | 67.0 | 1.84 | 10-60 | 24.00 | 230 | 14 | -17 | |
| Special Polymer | 64 | 1.78 | 10-60 | 19.00 | 180 | 20 | -30 | |
| Special Polymer | 67 | 1.83 | 10-60 | 19.00 | 190 | 18 | -2 |