Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Fluoroelastomer (FKM) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | High-Temperature & Specialty Elastomers | Oil & Fuel Resistant Elastomers |
| ASTM Designation | FKM | NBR |
| ISO Designation | FPM | NBR |
| ASTM-D2000 Designation | Type HK | Type BF / BG / CH |
| Element | Fluoroelastomer (FKM) | Nitrile Butadiene Rubber (NBR) |
|---|
| Mechanical Parameter | Fluoroelastomer (FKM)Standard Bisphenol-Cured Compound (Post-Cured 16h at 230°C) | Nitrile Butadiene Rubber (NBR)Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) |
|---|---|---|
| Compression Set (22h at 100°C) · Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) · RANGE · 100 °CUnit: % | — % | 15–30 % |
Machinability: Cryogenically deflashed with liquid nitrogen; turned on CNC lathes equipped with diamond-sharp carbide cutters.
Formability / Cold Working: Milled on cool water-chilled roll mills; compounded with mineral fillers and basic metal oxides (Ca(OH)₂ and MgO) as acid acceptors. Compression, transfer, and injection molded; extruded into chemical tubing.
Heat Treatment & Annealing: Bisphenol cure (standard Type 1) or peroxide cure (for aggressive sour gas/acid resistance). Mandatory oven post-cure at 230°C for 16 to 24 hours to complete crosslinking and achieve minimum compression set.
Machinability: Cryogenically deflashed with polycarbonate media or liquid nitrogen tumbling; turned on CNC lathes equipped with frozen chuck fixtures.
Formability / Cold Working: Readily compounded in internal mixers with carbon black, plasticizers (phthalates, adipates), and cure packages. Formed by high-precision compression, transfer, and multi-cavity injection molding; extruded into fuel hose inner tubes.
Heat Treatment & Annealing: Vulcanized with sulfur/accelerator packages for optimal dynamic fatigue or peroxide cure packages for improved compression set and heat resistance up to 120°C.