Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Butyl Rubber (IIR) | Ethylene Propylene Diene Rubber (EPDM) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Weathering & Chemical Resistant Elastomers | Weathering & Chemical Resistant Elastomers |
| ASTM Designation | IIR | EPDM |
| ISO Designation | IIR | EPDM |
| ASTM-D2000 Designation | Type BA | Type BA / CA |
| Element | Butyl Rubber (IIR) | Ethylene Propylene Diene Rubber (EPDM) |
|---|
| Mechanical Parameter | Butyl Rubber (IIR)Standard Gas-Barrier Vulcanizate (Resin Cured) | Ethylene Propylene Diene Rubber (EPDM)Peroxide-Cured High-Temperature Compound |
|---|---|---|
| Compression Set (22h at 70°C) · Standard Gas-Barrier Vulcanizate (Resin Cured) · RANGE · 70 °CUnit: % | 20–45 % | — % |
| Compression Set (22h at 100°C) · Peroxide-Cured High-Temperature Compound · RANGE · 100 °CUnit: % | — % | 15–30 % |
Machinability: Cryogenically frozen below -60°C for precision die cutting and trimming.
Formability / Cold Working: High cold flow in uncured gum requires careful handling. Compounded on cool roll mills or internal mixers; extruded into inner tubes and calendered into barrier liners.
Heat Treatment & Annealing: Vulcanized via accelerated sulfur packages, phenolic resin cure systems (for high-temperature water/steam endurance), or quinoid cure packages at 150°C to 175°C.
Machinability: Cryogenically machined; waterjet cut without abrasive garnets for pure elastomer gaskets.
Formability / Cold Working: Readily compounded in internal mixers with high paraffinic oil and carbon black loading. Extruded into dense and sponge weatherstrip profiles with continuous microwave/hot-air vulcanization (HAV) lines; precision injection molded.
Heat Treatment & Annealing: Vulcanized via sulfur-accelerator systems for rapid extrusion cure or organic peroxide systems (dicumyl peroxide, DTBP) for superior compression set, heat resistance up to 150°C, and steam resistance.