Covestro Makrolon® 6557 RE PC Resin
Plastic Granules
Makrolon 6557 RE PC Resin Bio-circular Grade
Makrolon® 6557 RE is a flame-retardant, UV-stabilized polycarbonate resin with medium viscosity and easy-release properties. It offers UL 94V-0 compliance at 3.0 mm thickness, bio-circular content via ISCC PLUS mass balance, and versatile color options (transparent/translucent/opaque). Ideal for high-safety injection-molded parts.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Flow Rate (MFR): 18 g/10 min (ISO 1133, 300 °C/1.2 kg)
- Density: 1.2 g/cm³ (ISO 1183-1)
Mechanical Properties (23 °C/50 % r. h.)
- Tensile Modulus: 2300 MPa (ISO 527-2)
- Tensile Stress at Yield: 63 MPa (ISO 527-2)
- Tensile Strain at Yield: 6% (ISO 527-2)
- Charpy Impact Strength (Notched, 23 °C): 55 kJ/m² (ISO 179/1eA)
Thermal Properties
- Heat Deflection Temperature (HDT, 1.8 MPa): 125 °C (ISO 75-1/-2)
- Vicat Softening Temperature (50 N): 145 °C (ISO 306)
- Glass Transition Temperature (Tg): Approx. 150 °C (DSC Method)
Electrical Properties (23 °C/50 % r. h.)
- Volume Resistivity: >10^15 Ω·cm (IEC 60093)
- Dielectric Strength: 30 kV/mm (IEC 60243-1)
- Relative Permittivity (1 MHz): 3.0 (IEC 60250)
Other Properties (23 °C)
- Water Absorption (Saturation at 23 °C): 0.3% (ISO 62)
- Flammability Rating: UL 94 V-2 (1.5 mm)
Processing and Drying Conditions
- Drying Temperature: 120 °C
- Drying Time: 4–6 hours
- Recommended Processing Temperature: 280–320 °C
- Mold Temperature: 80–120 °C
Features & Benefits
Superior Flame Retardancy
It meets strict UL 94V-0 (3.0 mm) and V-2 (0.75 mm) standards, with high oxygen index (36%) and glow-wire resistance (960°C). Ensures safety in electrical/electronic components, reducing fire risks.
Sustainable Performance
Partially bio-circular via ISCC PLUS mass balance, reducing carbon footprint. Maintains high mechanical strength (66 MPa yield stress) while supporting eco-conscious manufacturing goals.
Process Efficiency
Medium viscosity (MVR 10 cm³/10 min) and easy-release formulation enable smooth injection molding at 280–320°C. Cuts cycle times and minimizes defects like sticking or warping.
Use & Applications
- Electrical Enclosures: UL-certified housings for switches/connectors.
- Automotive Parts: Flame-retardant interior trim and sensor housings.
- Consumer Electronics: Laptop casings, charger bodies, and LED diffusers.
- Industrial Components: Machinery guards and safety equipment.