Covestro Makrolon® LED2245 PC Resin
Makrolon LED2245 Polycarbonate Granules Optical Grade
Makrolon® LED2245 by Covestro is a high-flow, optical-grade PC resin engineered for precision light guides and lenses. With an MVR of 34 cm³/10 min (300°C/1.2kg), it delivers exceptional clarity (>89% transmission at 3mm), low viscosity for intricate molds, and easy demolding. Perfect for LED applications demanding brilliance and manufacturability.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (300 °C/1.2 kg): 34 cm³/10 min (ISO 1133)
- Molding Shrinkage (Parallel, 60x60x2 mm³/500 bar): 0.65% (ISO 294-4)
- Molding Shrinkage (Normal, 60x60x2 mm³/500 bar): 0.7% (ISO 294-4)
Mechanical Properties (23 °C / 50% r.h.)
- Tensile Modulus (1 mm/min): 2350 MPa (ISO 527-1/-2)
- Yield Stress (50 mm/min): 63 MPa (ISO 527-1/-2)
- Yield Strain (50 mm/min): 6.0% (ISO 527-1/-2)
- Nominal Strain at Break (50 mm/min): > 50% (ISO 527-1/-2)
- Flexural Modulus (2 mm/min): 2350 MPa (ISO 178)
- Flexural Strength (2 mm/min): 97 MPa (ISO 178)
- Charpy Notched Impact Strength (23 °C/3 mm): 60 kJ/m² (ISO 21305/based on ISO 179/1eA)
- Charpy Notched Impact Strength (-30 °C/3 mm): 12 kJ/m² (ISO 21305/based on ISO 179/1eA)
Thermal Properties
- Glass Transition Temperature: 145 °C (ISO 11357-1/-2)
- HDT (1.80 MPa): 125 °C (ISO 75-1/-2)
- HDT (0.45 MPa): 138 °C (ISO 75-1/-2)
- Vicat Softening Temperature (50 N, 50 °C/h): 145 °C (ISO 306)
- Coefficient of Linear Thermal Expansion (Parallel and Normal, 23-55 °C): 0.65 × 10⁻⁴/K (ISO 11359-1/-2)
- Glow Wire Test (GWFI, 1.5 mm): 875 °C (IEC 60695-2-12)
- Burning Behavior (UL 94, 0.75 mm): V-2 (CL)
Electrical Properties (23 °C / 50% r.h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Relative Permittivity (1 MHz): 3.0 (IEC 60250)
- Dissipation Factor (100 Hz): 5 × 10⁻⁴ (IEC 60250)
- Dissipation Factor (1 MHz): 95 × 10⁻⁴ (IEC 60250)
- Volume Resistivity: 1 × 10¹⁴ Ω·m (IEC 62631-3-1)
- Surface Resistivity: 1 × 10¹⁶ Ω (IEC 62631-3-2)
- Electrical Strength (1 mm): 34 kV/mm (IEC 60243-1)
Other Properties (23 °C)
- Water Absorption (Saturation Value): 0.30% (ISO 62)
- Water Absorption (Equilibrium Value, 23 °C/50% r.h.): 0.12% (ISO 62)
- Density: 1190 kg/m³ (ISO 1183-1)
- Luminous Transmittance (Clear, 2 mm): 90% (ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature Range: 250-300 °C (Recommended: 270 °C)
- Mold Temperature Range: 80-120 °C
- Drying Temperature: 120 °C
- Drying Time: 2-3 hours
- Maximum Moisture Content: ≤ 0.02%
Features & Benefits
Unmatched Optical Clarity
Achieve crystal-clear light diffusion with luminous transmittance >89% (up to 4mm thickness) and haze <0.5%. Ideal for LED lenses and displays where brightness uniformity is critical.
Superior Process Efficiency
High melt-flow (34 cm³/10 min) enables easy filling of thin-walled geometries (e.g., micro-optics), reducing cycle times and energy costs in injection molding.
Thermal & Mechanical Resilience
It withstands 138°C deflection temperatures (0.45 MPa) and offers high impact strength (60 kJ/m² notched Charpy). Ensures durability in automotive or outdoor LED housings.
Use & Applications
- LED Light Guides: Edge-lit panels, automotive taillights, and backlit displays requiring uniform diffusion.
- Optical Lenses: Thin-walled lenses for sensors and consumer electronics.
- Transparent Housings: Protective covers for indicators and control panels.
- Precision Components: Medical device light pipes and touch-screen interfaces.
