Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Polyester Polyurethane (AU) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Polyurethane Elastomers | Oil & Fuel Resistant Elastomers |
| ASTM Designation | AU | NBR |
| ISO Designation | AU | NBR |
| ASTM-D2000 Designation | Type BG (AU) | Type BF / BG / CH |
| Element | Polyester Polyurethane (AU) | Nitrile Butadiene Rubber (NBR) |
|---|
| Mechanical Parameter | Polyester Polyurethane (AU)Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) | Nitrile Butadiene Rubber (NBR)Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) |
|---|---|---|
| Compression Set (22h at 70°C) · Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) · RANGE · 70 °CUnit: % | 20–35 % | — % |
| Compression Set (22h at 100°C) · Standard 70 Shore A O-Ring Vulcanizate (Medium ACN ~33%) · RANGE · 100 °CUnit: % | — % | 15–30 % |
| Hardness Scale | Polyester Polyurethane (AU) | Nitrile Butadiene Rubber (NBR) |
|---|---|---|
| SHORE_A Hardness · Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) · RANGE | 60–95 SHORE_A | — |
Machinability: Machined on conventional metalworking lathes using razor-sharp high-rake tooling and light depths of cut; ground with open-coat grinding wheels.
Formability / Cold Working: Processed via liquid cast prepolymer dispensing (open gravity or centrifugal molding) or thermoplastically injection molded/extruded (TPU pellets).
Heat Treatment & Annealing: Cast parts are demolded after initial gelling and subjected to post-cure ovens at 100°C to 110°C for 16 to 24 hours to achieve complete hard-segment phase separation and ultimate mechanical properties.
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.