PEEK (polyetheretherketone) – carbon nano-filler
Reinforced carbon nanotubes
✓ This material meets the criteria ~ Specialized grades may meet this criteria
| Density | 1.32 to 1.49 g/cm³ ASTM D792 |
|---|---|
| Charpy notched impact | 6 kJ/m2 |
| Flexural modulus | 4110 to 12900 MPa ASTM D790 |
| Flexural resistance | 160 MPa |
| Tensile modulus | 3920 to 13100 MPa ASTM D638 |
| Tensile resistance | 82.7 to 190 MPa ASTM D638 |
| Tensile strain | 2.0 to 3.0 % ASTM D638, Yield |
Injection at 360–400 °C, mould at 150–200 °C. Strict pre-drying: 6–8 hours at 150 °C. Requires high-performance injection moulding machines with a thermal barrier. Very high viscosity → high injection pressure. Moderate shrinkage (1.0–1.5 %).
PEEK is difficult to recycle economically. Production scrap is carefully recovered and reground for mixing into filled grades. Chemical recycling remains in the research stage.
Certain PEEK grades are approved for food contact (FDA, EU Regulation 10/2011) and medical applications (USP Class VI, ISO 10993). They are used in high-temperature food processing equipment and sterilisable surgical instruments.