Covestro Makrolon® AL2447 PC Resin
Plastic Granules
Makrolon AL2447 Polycarbonate Granules Injection Molding Grade
Covestro Makrolon® AL2447 is a UV-stabilized, low-viscosity polycarbonate resin engineered for automotive lighting. Featuring optical clarity (89% transmittance), easy mold release, and availability in transparent/signal colors, it excels in high-precision injection molding for demanding applications like headlamp lenses.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (MVR): 19 cm³/10 min (300 °C/1.2 kg; ISO 1133)
- Melt Mass-Flow Rate (MFR): 20 g/10 min (300 °C/1.2 kg; ISO 1133)
- Molding Shrinkage:
- Parallel: 0.65% (60x60x2 mm³/500 bar; ISO 294-4)
- Normal: 0.7% (60x60x2 mm³/500 bar; ISO 294-4)
Mechanical Properties (23 °C/50 % r. h.)
- Tensile Modulus: 2400 MPa (1 mm/min; ISO 527-1/-2)
- Yield Stress: 66 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: 70 MPa (5 mm/min; ISO 527-1/-2)
- Strain at Break: 130% (5 mm/min; ISO 527-1/-2)
- Flexural Modulus: 2350 MPa (2 mm/min; ISO 178)
- Flexural Strength: 98 MPa (2 mm/min; ISO 178)
- Charpy Notched Impact Strength:
- 23 °C: 65 kJ/m² (ISO 21305 based on ISO 179/1eA)
- -30 °C: 14 kJ/m² (ISO 21305 based on ISO 179/1eA)
Thermal Properties
- Glass Transition Temperature: 145 °C (10 °C/min; ISO 11357-1/-2)
- Deflection Temperature Under Load (HDT):
- 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: 144 °C (ISO 306)
- 50 N; 120 °C/h: 145 °C (ISO 306)
- Burning Behavior:
- UL 94 (0.75 mm): V-2
- UL 94 (2.7 mm): HB
Electrical Properties (23 °C/50 % r. h.)
- Relative Permittivity:
- 100 Hz: 3.1 (IEC 60250)
- 1 MHz: 3.0 (IEC 60250)
- Dissipation Factor:
- 100 Hz: 5 x 10⁻⁴ (IEC 60250)
- 1 MHz: 90 x 10⁻⁴ (IEC 60250)
- Volume Resistivity: 1E14 Ohm·m (IEC 62631-3-1)
- Surface Resistivity: 1E16 Ohm (IEC 62631-3-2)
- Electrical Strength: 34 kV/mm (1 mm; IEC 60243-1)
Other Properties (23 °C)
- Water Absorption:
- Saturation: 0.30% (ISO 62)
- Equilibrium (23 °C; 50 % r. h.): 0.12% (ISO 62)
- Density: 1200 kg/m³ (ISO 1183-1)
Processing and Drying Conditions
- Melt Temperature: 280 – 320 °C (ISO 294)
- Mold Temperature: 80 – 120 °C (ISO 294)
- Drying Temperature: 120 °C
- Drying Time: 2-3 hours
- Moisture Content (Max): ≤0.02%
Features & Benefits
Superior Optical Clarity
With luminous transmittance up to 89% and haze below 0.5%, AL2447 delivers crystal-clear light diffusion—ideal for automotive lenses requiring uncompromised visibility and aesthetic appeal.
UV Stability & Weather Resistance
UV stabilization prevents yellowing and degradation, ensuring long-term performance in harsh environments. Perfect for exterior automotive lighting exposed to sunlight and temperature extremes.
High Flow & Easy Processing
Low viscosity (MVR 19 cm³/10 min) enables effortless filling of intricate molds, while easy-release properties reduce cycle times and defects—boosting production efficiency.
Use & Applications
- Automotive Forward Lighting: Headlamp lenses requiring UV resistance, optical clarity, and impact durability.
- Signal Lighting: High-visibility brake lights/turn signals using vibrant, fade-resistant colors.
- Complex Injection Molding: Thin-walled or intricate components needing low-viscosity flow and easy release.
