PTFE offers the lowest friction and broadest chemical resistance of any plastic, ideal for seals and chemical environments. PEEK provides far superior mechanical strength and dimensional precision for structural applications.
| Property | PTFE (Teflon) | PEEK (Polyether Ether Ketone) |
|---|---|---|
| Tensile Strength | 27 MPa (3.9 ksi) | 100 MPa (14.5 ksi) |
| Yield Strength | 12 MPa (1.7 ksi) | 91 MPa (13.2 ksi) |
| Hardness | Shore D55 | Rockwell M99 |
| Density | 2.15 g/cm³ | 1.31 g/cm³ |
| Machinability Rating | 65/100 | 60/100 |
| Thermal Conductivity | 0.25 W/m·K | 0.25 W/m·K |
| Melting Point | 327 °C | 343 °C |
| Tolerance | ±0.05 mm | ±0.02 mm |
| Property | PTFE (Teflon) | PEEK (Polyether Ether Ketone) | Winner |
|---|---|---|---|
| Friction Coefficient | 0.04 (lowest) | 0.35 | PTFE |
| Tensile Strength | 27 MPa | 100 MPa | PEEK |
| Chemical Resistance | Universal | Excellent | PTFE |
| Dimensional Stability | Poor (creeps) | Good | PEEK |
| Temperature Range | -200 to 260°C | -60 to 260°C | PTFE |
| Cost | ~$20/kg | ~$100+/kg | PTFE |
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