Fluoroelastomer is renowned for outstanding heat, oil and chemical resistance, making it the elastomer of choice for automotive, aerospace, petrochemical and semiconductor sealing. Guangyuan supplies the 26-type, 246-type and peroxide-cured series.
Technical Parameters
Note: the parameters above are typical values for the standard grades of each series and are for selection reference only; actual specifications follow the official TDS for the selected grade and the agreed contract.
JHF26 Series (Bispolymer FKM)
A 26-type raw gum copolymerised from vinylidene fluoride and hexafluoropropylene, ~66% fluorine, general oil and heat resistance. Standard: Q/JHSG208-2021.
| Property | Nominal value |
|---|---|
| Grades / Mooney ML(1+10)121°C | JHF2601: 5–15 | JHF2602: 15–40 | JHF2603: 41–60 | JHF2604: 61–100 | 101–160 | 161–200 |
| Appearance | White or light-yellow sheet |
| Fluorine content % | approx. 66 |
| Specific gravity g/cm³ | 1.80–1.84 |
| Tensile strength MPa ≥ (before ageing) | 11 |
| Elongation at break % ≥ | 150 |
| Tear strength ≥ | 70–85 |
| Compression set (200°C×24h) % ≤ | 20 |
| Heat ageing (200°C×24h) % ≤ | 5 |
| After ageing (200°C×70h) MPa ≥ / % ≥ | 9.0 / 120 |
JHF246 Series (Terpolymer FKM)
Terpolymer of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene — improved low-temperature, acid/alkali and solvent resistance. Standard: Q/JHSG266-2021.
| Property | Nominal value |
|---|---|
| Grades | JHF246C / JHF2461 / JHF2462 / JHF2463 / JHF2465 |
| Mooney ML(1+10)121°C | ≥20 / 15–40 / 41–65 / 66–130 / ≥20 |
| Specific gravity g/cm³ | 1.77–1.82 / 1.83–1.86 / 1.87–1.90 |
| Tensile strength MPa ≥ | 10 / 16 / 10 |
| Elongation at break % ≥ | 150 / 180 |
| Compression set (200°C×70h) % ≤ | 35 |
| Compression ratio (25%, 70h) % ≤ | 70–85 |
| Hardness (Shore A) | 70–85 |
| Heat ageing (250°C×70h) MPa ≥ / % ≥ | 9 / 100 |
Peroxide-Vulcanized Fluoroelastomer
Compared with bisphenol-cured 26/246 types, offering better chemical, media and high-temperature resistance — for automotive fuel systems, chemical sealing and semiconductors. Standard: Q/JHSG382-2021.
| Property | Nominal value |
|---|---|
| Grades | JHF2552 / JHF2533 / JHF2530 / JHF2535 / JHF2565 / JHF2561 |
| Fluorine content % | 70 / 68.5 / 66 |
| Specific gravity g/cm³ | 1.87–1.90 / 1.83–1.86 / 1.77–1.82 |
| Mooney ML(1+10)121°C | 100 / 10–200 |
| Tensile strength MPa ≥ | 20 |
| Elongation at break % ≥ | 240 |
| Compression set (200°C×70h) % ≤ | 35 |
| Compression ratio (25%, 70h) % ≤ | 65–85 |
| Hardness (Shore A) | 65–85 |
Applications
- Automotive oil seals, O-rings and hoses
- Aerospace fuel-system sealing
- Petrochemical gaskets and corrosion-resistant seals
- Semiconductor and precision machinery seals
Packaging & Storage
Sheet packed with interleaving film; 25 kg per carton or as required.
The raw gum is stable below 260 °C; decomposition begins around 320 °C, releasing highly toxic hydrogen fluoride and fluorocarbon gases — ventilation is essential. Never blend with metal powders such as aluminium or magnesium (violent reaction and explosion hazard).
Technical Downloads
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