Intent: Peak tensile strength (55 MPa), tear resistance, and mineral oil endurance of polyester urethane (AU) versus superior hydrolytic resistance in warm water and microbial resistance of polyether urethane (EU).
Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Polyester Polyurethane (AU) | Polyether Polyurethane (EU) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Polyurethane Elastomers | Polyurethane Elastomers |
| ASTM Designation | AU | EU |
| ISO Designation | AU | EU |
| ASTM-D2000 Designation | Type BG (AU) | Type BG (EU) |
| Element | Polyester Polyurethane (AU) | Polyether Polyurethane (EU) |
|---|
| Mechanical Parameter | Polyester Polyurethane (AU)Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) | Polyether Polyurethane (EU)Cast PTMEG-Based Polyether Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) |
|---|---|---|
| Compression Set (22h at 70°C) · Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) · RANGE · 70 °CUnit: % | 20–35 % | 22–38 % |
| Hardness Scale | Polyester Polyurethane (AU) | Polyether Polyurethane (EU) |
|---|---|---|
| SHORE_A Hardness · Cast Prepolymer Vulcanizate (Post-Cured 16h at 100°C, 90 Shore A) · RANGE | 60–95 SHORE_A | 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: Lathe turned with sharp ground high-speed steel tools; cryogenically machined with liquid nitrogen for complex seals.
Formability / Cold Working: Processed via two-component liquid casting or thermoplastic polyurethane (TPU) extrusion and injection molding with vacuum degassing.
Heat Treatment & Annealing: Post-cured in hot-air ovens at 100°C for 16 to 24 hours to achieve maximum mechanical property development.