Covestro Makrolon® 6557 RE

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Makrolon PC Polycarbonate

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.

  • Character: flame retardant; MVR (300 °C/1.2 kg) 10 cm³/10 min; UL 94V-0/3.0 mm; medium viscosity; UV stabilized; easy release; available in transparent, translucent and opaque colors. CQ renewable attributed.
  • Application: Injection molding
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Key technical data (ISO)

  • Tensile Modulus: 2,400 MPa | Yield Stress: 66 MPa
  • Impact Resistance: Charpy notched (23°C): 70 kJ/m² (partial break)
  • Elongation at Break: >130%
  • Heat Deflection (1.8 MPa): 124°C | Vicat Softening: 143°C
  • UL Relative Temp Index: 125°C (electrical/strength)
  • CTI: 225 (Solution A) | Volume Resistivity: 1E14 Ω·m
  • Electrical Strength: 34 kV/mm (1 mm thickness)
  • Density: 1,200 kg/m³ | Water Absorption: 0.12% (50% RH)
  • Mold Shrinkage: 0.6–0.8% | Drying: 120°C for 2–3 hours

Download

Makrolon 6557 RE ISO Data SheetDownload

Application

  • 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.

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.

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