Ultem is the flame-retardant champion certified for aircraft interiors with inherent self-extinguishing properties. PEEK offers higher temperature resistance and chemical inertness for the most extreme environments.
| Property | Ultem (PEI) | PEEK (Polyether Ether Ketone) |
|---|---|---|
| Tensile Strength | 85 MPa (12.3 ksi) | 100 MPa (14.5 ksi) |
| Yield Strength | 85 MPa (12.3 ksi) | 91 MPa (13.2 ksi) |
| Hardness | Rockwell M109 | Rockwell M99 |
| Density | 1.27 g/cm³ | 1.31 g/cm³ |
| Machinability Rating | 55/100 | 60/100 |
| Thermal Conductivity | 0.22 W/m·K | 0.25 W/m·K |
| Melting Point | 217 °C (Tg) | 343 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
| Property | Ultem (PEI) | PEEK (Polyether Ether Ketone) | Winner |
|---|---|---|---|
| Max Temperature | 170°C continuous | 260°C continuous | PEEK |
| Flame Retardancy | UL94 V-0 (inherent) | UL94 V-0 | Ultem |
| Cost | ~$40/kg | ~$100+/kg | Ultem |
| Chemical Resistance | Good | Exceptional | PEEK |
| Tensile Strength | 85 MPa | 100 MPa | PEEK |
| Smoke/Toxicity | Extremely low | Low | Ultem |
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