Material Comparison
Compare verified engineering materials side by side with condition-specific mechanical properties.
| Parameter | Butyl Rubber (IIR) | Natural Rubber (NR) |
|---|---|---|
| Material Family | Rubber & Elastomers | Rubber & Elastomers |
| Subfamily | Weathering & Chemical Resistant Elastomers | General-Purpose Diene Rubbers |
| ASTM Designation | IIR | NR |
| ISO Designation | IIR | NR |
| ASTM-D2000 Designation | Type BA | Type AA |
| Element | Butyl Rubber (IIR) | Natural Rubber (NR) |
|---|
| Mechanical Parameter | Butyl Rubber (IIR)Standard Gas-Barrier Vulcanizate (Resin Cured) | Natural Rubber (NR)Standard Formulated Vulcanizate (Carbon Black Reinforced) |
|---|---|---|
| Compression Set (22h at 70°C) · Standard Gas-Barrier Vulcanizate (Resin Cured) · RANGE · 70 °CUnit: % | 20–45 % | 15–35 % |
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 with liquid nitrogen (-196°C) to freeze elastomer below glass transition temperature (Tg ≈ -70°C) for precision lathe turning, grinding, or CNC waterjet cutting with abrasive garnets.
Formability / Cold Working: Masticated on two-roll mills or internal mixers (Banbury) to reduce Mooney viscosity prior to compounding. Readily molded via compression, transfer, or injection molding, and shaped via calendar sheet rolling and multi-cavity extrusion.
Heat Treatment & Annealing: Vulcanized via accelerated sulfur cure systems (typically 140°C to 160°C for 5 to 30 minutes) or semi-EV/EV (efficient vulcanization) formulations to optimize reversion resistance and minimize compression set.