PC Covestro 2458
Material Introduction: PC Covestro 2458 is an injection‑molding grade polycarbonate widely used in medical‑device industry. It is well‑known for biocompatibility, excellent sterilization compatibility and favorable comprehensive mechanical properties.
Main Applications
- Medical Devices (Core Application): Medical supplies requiring repeated sterilization, such as syringes, infusion equipment, surgical instruments, dialyzers, medical cups, tubes, bottles, dental instruments, drug containers and surgical tools.
- Electronic & Electrical: Connectors, switches, relay housings, household‑appliance housings, capacitors, etc.
- Automotive Industry: Headlamp covers, instrument‑panel assemblies and other components.
- Consumer & Industrial Parts: Safety helmets, face shields, spectacle lenses, toys, models and other products.
Physical Properties
| Property Item |
Test Condition / Standard |
Data |
Unit |
| Density |
23°C, ISO 1183 |
1.20 |
g/cm³ |
| Melt Volume‑flow Rate (MVR) |
300°C/1.2 kg, ISO 1133 |
19.0 |
cm³/10min |
| Molding Shrinkage‑Flow Direction |
‑ |
0.50‑0.70 |
% |
| Molding Shrinkage‑Transverse Direction |
‑ |
0.50‑0.70 |
% |
| Saturated Water Absorption |
23°C, ISO 62 |
0.30 |
% |
| Tensile Modulus |
23°C, ISO 527‑2/1 |
2400 |
MPa |
| Tensile Stress (Yield) |
23°C, ISO 527‑2/50 |
65.0 |
MPa |
| Elongation at Break |
23°C, ISO 527‑2/50 |
130 |
% |
| Flexural Modulus |
23°C, ISO 178 |
2350 |
MPa |
| Flexural Stress |
23°C, ISO 178 |
97.0 |
MPa |
| Charpy Notched Impact Strength |
23°C, ISO 179/1eA |
65 |
kJ/m² |
| Charpy Un‑notched Impact Strength |
23°C, ISO 179/1eU |
No break |
‑ |
Thermal & Electrical Properties
| Property Item |
Test Condition / Standard |
Data |
Unit |
| HDT (1.8 MPa, unannealed) |
ISO 75‑2/A |
125 |
°C |
| HDT (0.45 MPa, unannealed) |
ISO 75‑2/B |
139 |
°C |
| Glass Transition Temperature (Tg) |
ISO 11357‑2 |
146 |
°C |
| Vicat Softening Temperature |
ISO 306/B50 |
145 |
°C |
| |
ISO 306/B120 |
146 |
°C |
| Ball‑Pressure Test |
138°C, IEC 60695‑10‑2 |
Pass |
‑ |
| Linear Thermal Expansion Coefficient |
23‑55°C, ISO 11359‑2 |
6.5E‑5 |
cm/cm/°C |
| Volume Resistivity |
23°C, IEC 60093 |
1.0E+16 |
Ω·cm |
| Dielectric Strength |
23°C, 1.0 mm, IEC 60243‑1 |
34 |
kV/mm |
| UL94 Flame Rating |
1.5 mm |
HB |
‑ |
| |
0.75 mm (to be verified) |
V‑2 |
‑ |
Optical Properties
| Property Item |
Test Condition / Standard |
Data |
Unit |
| Light Transmittance |
1000 μm, ISO 13468‑2 |
89.0 |
% |
| |
3000 μm, ISO 13468‑2 |
88.0 |
% |
| Haze |
3000 μm, ISO 14782 |
＜0.80 |
% |
| Refractive Index |
ISO 489 |
1.586 |
‑ |
Injection Molding Processing Parameters
| Processing Stage |
Parameter Item |
Suggested Range / Operation Notes |
Unit / Remarks |
| Pre‑drying |
Drying Temperature |
120 |
°C |
| |
Drying Time |
2.0‑4.0 (minimum 2‑4 hours) |
h |
| |
Allowable Moisture Content |
≤ 0.02% |
Critical requirement |
| Injection Temperature |
Rear Barrel Temperature |
250‑260 |
°C |
| |
Middle Barrel Temperature |
270‑280 |
°C |
| |
Front Barrel Temperature |
280‑290 |
°C |
| |
Nozzle Temperature |
290‑300 |
°C |
| |
Melt Temperature |
280‑320 (upper limit for thin‑wall parts; lower limit for thick‑wall parts) |
°C |
| |
Mold Temperature |
80‑120 |
°C (higher mold temperature reduces internal stress and improves filling & surface appearance) |
| Injection Settings |
Back Pressure |
5‑15 |
MPa (recommended below 10 bar to reduce degradation risk) |
| |
Injection Speed |
Adopt slow‑fast combined profile to avoid silver‑streak defects |
‑ |
| |
Vent Gate Depth |
0.025‑0.075 |
mm |
Disclaimer: All above data is for reference only.
