PC (polycarbonate) + PBT (polybutylene terephthalate)
✓ This material meets the criteria ~ Specialized grades may meet this criteria
| Density | 1.20 to 1.22 g/cm³ ISO 1183 |
|---|---|
| Charpy notched impact | 8.9 to 62 kJ/m2 |
| Flexural modulus | 1850 to 2530 MPa ISO 178 |
| Flexural resistance | 90 MPa |
| Tensile modulus | 1970 to 2470 MPa ISO 527-1 |
| Tensile resistance | 35.0 to 86.0 MPa ISO 527-1, -2 |
| Tensile strain | Fifteen to fifty-one % ISO 527-1, -2, Break |
Injection at 270–320 °C, mould at 80–120 °C. Pre-drying is essential: 4–6 hours at 120 °C. Highly susceptible to hydrolysis if damp. High viscosity requires high pressure. Low shrinkage (0.5–0.8 %). Take care with birefringence on optical components.
The PC is recyclable (code 7). Chemical depolymerisation allows for the recovery of BPA and diphenyl carbonate. Mechanical recycling is common in industry but degrades transparency and impact resistance after several cycles.
PC-FDA grades are approved for food contact. Beware of older grades that may contain BPA. Modern BPA-free grades comply with EU regulation 10/2011 for certain uses. Always check the specific grade.