Covestro Makrolon® LED2245 EL PC Resin
Plastic Granules
Makrolon LED2245 EL Polycarbonate Granules
Makrolon LED2245 EL is a low-viscosity, easy-release polycarbonate resin optimized for injection molding. With an MVR of 34 cm³/10 min (300°C/1.2 kg) and exceptional optical clarity (>85% transmittance), it streamlines production of precision light guides and optical components.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt volume-flow rate (MVR): 34 cm³/10 min (300 °C/1.2 kg, ISO 1133)
- Molding shrinkage (parallel): 0.69 % (60x60x2 mm³/500 bar, ISO 294-4)
- Molding shrinkage (normal): 0.7 % (60x60x2 mm³/500 bar, ISO 294-4)
Mechanical Properties (23 °C/50 % r. h.)
- Tensile modulus: 2200 MPa (1 mm/min, ISO 527-1,-2)
- Yield stress: 63 MPa (50 mm/min, ISO 527-1,-2)
- Yield strain: 6.0 % (50 mm/min, ISO 527-1,-2)
- Nominal strain at break: > 50 % (50 mm/min, ISO 527-1,-2)
- Stress at break: 60 MPa (50 mm/min, ISO 527-1,-2)
- Strain at break: 125 % (50 mm/min, ISO 527-1,-2)
- Charpy notched impact strength:
- 23 °C: 60 kJ/m² (3 mm, ISO 21305/ISO 179/1eA)
- -30 °C: 15 kJ/m² (3 mm, ISO 21305/ISO 179/1eA)
- Izod notched impact strength:
- 23 °C: 55 kJ/m² (3 mm, ISO 21305/ISO 180/A)
- -20 °C: 13 kJ/m² (3 mm, ISO 21305/ISO 180/A)
- Puncture impact properties:
- Maximum force (23 °C): 4900 N (ISO 6603-2)
- Maximum force (-30 °C): 5900 N (ISO 6603-2)
- Puncture energy (23 °C): 50 J (ISO 6603-2)
- Puncture energy (-30 °C): 55 J (ISO 6603-2)
Thermal Properties
- Glass transition temperature: 145 °C (10 °C/min, ISO 11357-1,-2)
- Temperature of deflection under load:
- 1.80 MPa: 125 °C (ISO 75-1,-2)
- 0.45 MPa: 138 °C (ISO 75-1,-2)
- Vicat softening temperature:
- 50 N, 50 °C/h: 145 °C (ISO 306)
- 50 N, 120 °C/h: 146 °C (ISO 306)
- Coefficient of linear thermal expansion (23–55 °C):
- Parallel: 0.65–0.70 × 10⁻⁴/K (ISO 11359-1,-2)
- Normal: 0.65–0.70 × 10⁻⁴/K (ISO 11359-1,-2)
- Oxygen index: 28 % (Method A, ISO 4589-2)
Other Properties (23 °C)
- Water absorption (saturation value): 0.30 % (Water at 23 °C, ISO 62)
- Water absorption (equilibrium value): 0.12 % (23 °C; 50 % r.h., ISO 62)
- Density: 1190 kg/m³ (ISO 1183-1)
- Bulk density (pellets): 660 kg/m³ (ISO 60)
- Haze: <13 % (4 mm, ISO 14782)
- Luminous transmittance: >85 % (4 mm, ISO 13468-2)
Processing and Drying Conditions
- Melt temperature (recommended): 250–300 °C
- Standard melt temperature: 270 °C
- Barrel temperatures:
- Rear: 230–240 °C
- Middle: 250–260 °C
- Front: 260–270 °C
- Nozzle: 260–270 °C
- Mold temperature: 80–120 °C
- Hold pressure: 50–75 % of injection pressure
- Plastic back pressure: 50–150 bar
- Peripheral screw speed: 0.05–0.2 m/s
- Shot-to-cylinder size: 30–70 %
- Dry air drying:
- Temperature: 120 °C
- Time: 2–3 h
- Moisture content (max.): ≤0.02 %
- Vent depth: 0.025–0.075 mm
Features & Benefits
Effortless Injection Molding
Low viscosity ensures smooth flow into intricate molds, reducing cycle times and energy costs. Ideal for high-volume production of complex parts.
Premium Optical Performance
85% luminous transmittance and <13% haze deliver crystal-clear light diffusion. Perfect for LED edge-lit displays requiring uniform brightness.
Reliable Thermal Stability
Deflection temperature of 138°C (0.45 MPa) and Vicat softening at 145°C ensure dimensional integrity in high-heat environments like automotive lighting.
Use & Applications
- LED Light Guides: Edge-lit panels for TVs, monitors, and automotive dashboards.
- Optical Components: Lenses, diffusers, and light pipes in consumer electronics.
- Signage & Displays: Backlit advertising panels and touchscreen interfaces.
- Architectural Lighting: Slim-profile LED fixtures requiring uniform illumination.
