Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Hydrogenated Nitrile Rubber (HNBR) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Oil & Fuel Resistant Elastomers | Oil & Fuel Resistant Elastomers |
| ASTM Designation | HNBR | NBR |
| ISO Designation | HNBR | NBR |
| ASTM-D2000 Designation | Type DH | Type BF / BG / CH |
| Element | Hydrogenated Nitrile Rubber (HNBR) | Nitrile Butadiene Rubber (NBR) |
|---|
| Property | Hydrogenated Nitrile Rubber (HNBR) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| 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) | Nitrile Butadiene Rubber (NBR)Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) |
|---|---|---|
| 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 % | — % |
| Compression Set (22h at 100°C) · Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) · RANGE · 100 °CUnit: % | — % | 15–30 % |
| Hardness Scale | Hydrogenated Nitrile Rubber (HNBR) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| 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 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.