Covestro Makrolon® LED2245 HP RE
Plastic Granules
Makrolon LED2245 HP RE Polycarbonate Granules Light Diffusion Grade
Makrolon LED2245 HP RE is a premium partially bio-circular polycarbonate resin (ISCC PLUS certified), engineered for precision optical components. With ultra-high light transmission (>90%), low viscosity for easy molding, and exceptional color stability, it excels in LED lenses, light guides, and demanding injection-molded optics.
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): 0.65% (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: 2350 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)
- Flexural Modulus: 2350 MPa (2 mm/min, ISO 178)
- Flexural Strength: 97 MPa (2 mm/min, ISO 178)
- Charpy Notched Impact Strength:
- 60 kJ/m² (23 °C/3 mm, ISO 21305/based on ISO 179/1eA)
- 12 kJ/m² (-30 °C/3 mm, ISO 21305/based on ISO 179/1eA)
- Puncture Impact Properties:
- Maximum Force: 4900 N (23 °C, ISO 6603-2)
- Puncture Energy: 55 J (23 °C, ISO 6603-2)
Thermal Properties
- Glass Transition Temperature: 145 °C (10 °C/min, ISO 11357-1,-2)
- Temperature of Deflection Under Load:
- 125 °C (1.80 MPa, ISO 75-1,-2)
- 138 °C (0.45 MPa, ISO 75-1,-2)
- Vicat Softening Temperature:
- 145 °C (50 N, 50 °C/h, ISO 306)
- Coefficient of Linear Thermal Expansion:
- 0.65 x 10⁻⁴/K (23 to 55 °C, ISO 11359-1,-2)
- Oxygen Index: 28% (Method A, ISO 4589-2)
Electrical Properties (23 °C/50 % r. h.)
- Relative Permittivity:
- 3.1 (100 Hz, IEC 60250)
- 3.0 (1 MHz, IEC 60250)
- Dissipation Factor:
- 0.0005 (100 Hz, IEC 60250)
- 0.0095 (1 MHz, IEC 60250)
- Electrical Strength: 34 kV/mm (1 mm, IEC 60243-1)
Other Properties (23 °C)
- Water Absorption (Saturation): 0.30% (Water at 23 °C, ISO 62)
- Water Absorption (Equilibrium): 0.12% (23 °C, 50 % r. h., ISO 62)
- Density: 1190 kg/m³ (ISO 1183-1)
- Bulk Density (Pellets): 660 kg/m³ (ISO 60)
- Refractive Index: 1.584 (Procedure A, ISO 489)
- Luminous Transmittance (Clear Transparent): >90% (2 mm, ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature: 250-300 °C (Standard: 270 °C)
- Mold Temperature: 80-120 °C
- Drying Temperature: 120 °C
- Drying Time: 2-3 hours
- Moisture Content (Max): ≤0.02%
- Injection Velocity: 200 mm/s (ISO 294)
- Hold Pressure (% of Injection Pressure): 50-75%
- Shot-to-Cylinder Size: 30-70%
Features & Benefits
Sustainable Optical Performance
It combines 30% bio-circular content (mass balance) with industry-leading clarity (>90% transmittance), reducing carbon footprint without sacrificing optical quality—ideal for eco-conscious lighting brands.
Flawless Molded Optics
It delivers <0.5% haze and minimal yellowing (YI <1.0), ensuring crisp light diffusion in lenses and light guides, even in complex thin-wall designs.
Easy High-Yield Processing
Low viscosity (MVR 34 cm³/10min) enables fast fills and easy release at 250–300°C melt temps, cutting cycle times and scrap rates for cost-efficient production.
Use & Applications
- Light Guides: Automotive dashboards, backlit displays.
- Precision Lenses: LED streetlights, stage lighting, VR/AR optics.
- Injection-Molded Optics: Thin-wall sensor covers, medical device windows.
