Molecular Architecture & Performance Logic
The polymer backbone is built from vinylidene fluoride (VDF), hexafluoropropylene (HFP) and tetrafluoroethylene (TFE) in a precise 40/30/30 ratio, yielding the highest fluorine content available in a commercial FKM. This dense fluorocarbon matrix creates an ultra-low surface energy barrier (< 18 mN m⁻¹) that repels non-polar hydrocarbons, polar ester oils, and aggressive additives such as methanol or biodiesel. The peroxide-scavenging bisphenol-AF cure system eliminates brittle post-cure embrittlement, giving > 20 MPa tensile strength and 35 kN m⁻¹ tear strength even after 1,000 h @ 200 °C. The result is a compound that outlives silicone and HNBR by 3× in the same thermal envelope while maintaining < 3 % volume swell in IRM903 reference oil.
Precision Properties Table (ASTM Methods)
| Property | Test Method | FKM-65B20 Value | Industry Benchmark |
| Density | ASTM D792 | 1.82 g cm⁻³ | 1.80–1.85 |
| Hardness | ASTM D2240 | 75 ± 3 Shore A | 70–80 |
| Tensile Strength | ASTM D412 | 20.5 MPa | > 18 MPa |
| Elongation @ Break | ASTM D412 | 230 % | > 180 % |
| Compression Set (200 °C × 70 h) | ASTM D395 | 18 % | < 25 % |
| Low-Temp Brittleness | ASTM D2137 | –25 °C | –20 °C |
| Volume Swell in Fuel C (23 °C × 70 h) | ASTM D471 | 1.2 % | < 5 % |
| Aging in Air 250 °C × 70 h | ASTM D573 | Tensile change –5 % | < –15 % |
Automotive Application Spectrum
Turbocharger Systems
Fuel & SCR Circuits
Engine & Transmission
Chassis & Brakes
ESP hydraulic accumulator bladders needing < 0.1 % fuel permeation.
Air-suspension bellows resisting ozone, road salt, and brake fluid.
Processing Guide & Forms
Compound Form: Pre-mixed slab, strip, or pellet ready for compression, transfer, or injection molding.
Typical Cure Cycle: 5 min @ 170 °C press + post-cure 2 h @ 200 °C (air) or 30 min @ 230 °C steam for < 1 % extractables.
Slab Dimensions: 300 mm × 300 mm × 10 mm (custom 2–30 mm).
Shelf Life: 12 months @ ≤ 25 °C in aluminum-foil/PE double bag; nitrogen-flushed to prevent oxidative scorch.
Certifications & Traceability
ISO 9001:2015 & IATF 16949:2016 certified compounding plant.
REACH & RoHS 3.0 full declaration (SVHC < 0.1 %).
SGS Test Report – tear, compression set, fuel swell (download PDF).
Conflict Minerals Statement – DRC-free sourcing.
Supply Chain & Logistics
| Order Type | MOQ | Lead Time | Packaging | Incoterm |
| Stock Compound | 25 kg | 7–10 days | PE bag + carton | EXW Shenzhen |
| Custom Color/Hardness | 250 kg | 3–4 weeks | Vacuum-sealed strip | FOB Shenzhen |
| Pelletized for Extrusion | 500 kg | 4–5 weeks | 25 kg foil bags | CIF Hamburg |
Bundle with Stainless-Steel Cable Ties
For turbocharger harnesses exposed to > 200 °C, pair FKM-65B20 gaskets with our 316 SS cable ties rated –80 °C to +538 °C for a complete thermal-chemical sealing system.
