Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Hydrogenated Nitrile Rubber (HNBR) | Fluoroelastomer (FKM) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Oil & Fuel Resistant Elastomers | High-Temperature & Specialty Elastomers |
| ASTM Designation | HNBR | FKM |
| ISO Designation | HNBR | FPM |
| ASTM-D2000 Designation | Type DH | Type HK |
| Element | Hydrogenated Nitrile Rubber (HNBR) | Fluoroelastomer (FKM) |
|---|
| Property | Hydrogenated Nitrile Rubber (HNBR) | Fluoroelastomer (FKM) |
|---|---|---|
| Density (Raw Copolymer Base) · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · TYPICALUnit: g/cm³ | 1 g/cm³ | — g/cm³ |
| Density (Cured Industrial Compound) · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGEUnit: g/cm³ | 1.15–1.3 g/cm³ | — g/cm³ |
| Mechanical Parameter | Hydrogenated Nitrile Rubber (HNBR)Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) | Fluoroelastomer (FKM)Standard Bisphenol-Cured Compound (Post-Cured 16h at 230°C) |
|---|---|---|
| Tensile Strength (Break) · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGE · 23 °CUnit: MPa | 15–30 MPa | — MPa |
| Ultimate Elongation at Break · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGE · 23 °CUnit: % | 200–500 % | — % |
| Tear Resistance · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGE · 23 °CUnit: kN/m | 35–65 kN/m | — kN/m |
| Compression Set (22h at 125°C) · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGE · 125 °CUnit: % | 15–28 % | — % |
| Hardness Scale | Hydrogenated Nitrile Rubber (HNBR) | Fluoroelastomer (FKM) |
|---|---|---|
| SHORE_A Hardness · Standard Peroxide-Cured 70 Shore A Compound (Fully Hydrogenated) · RANGE | 50–90 SHORE_A | — |
Machinability: Cryogenically machined with liquid nitrogen; precision waterjet cutting yields clean seal cross-sections without thermal scorch.
Formability / Cold Working: High Mooney viscosity requires high-shear internal mixing. Moldable via high-pressure compression, transfer, and injection molding with vacuum de-airing.
Heat Treatment & Annealing: Peroxide-cured (typically with co-agents such as TAC or TMPTM) at 160°C to 180°C to generate high carbon-carbon crosslink density for maximum thermal stability.
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.