Covestro Makrolon® 6557 PC Resin

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Makrolon PC Polycarbonate

Makrolon 6557 PC Resin Flame retardant grades

Covestro Makrolon 6557 is a flame retardant, medium viscosity polycarbonate resin. Offering UL 94 V-0 rating at 3.0 mm, excellent UV stabilization for durability, easy mold release, and versatility in transparent, translucent, or opaque colors.

  • 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.
  • Application: Injection molding
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Key technical data (ISO)

  • Melt Volume-Flow Rate: 10 cm³/10 min (300°C/1.2 kg)
  • Drying Conditions: 120°C for 2–3 hrs (max. moisture ≤0.02%)
  • Flame Safety UL 94 Rating (3.0 mm): V-0
  • Flame Safety Oxygen Index: 36%
  • Charpy Notched Impact: 70 kJ/m² at 23°C (Partial Break)
  • Thermal HDT @1.8 MPa: 124°C
  • Electrical CTI: 225
  • Molding Shrinkage Range: 0.6–0.8%
  • UV Stability: 89% luminous transmittance (1mm thickness)

Download

Makrolon 6557 ISO Data SheetDownload

Application

  • Electrical & Electronic Components: Switches, connectors, circuit breakers, fuse housings, terminal blocks, power supply enclosures.
  • Automotive Interior & Underhood: Sensor housings, lighting components (non-optical), connectors, small covers.
  • Consumer & Industrial Enclosures: Housings for power tools, small appliances, control units, safety equipment.
  • Outdoor Equipment Housings: Covers for communication devices, meters, garden tools.

Features & Benefits

Uncompromising Flame Safety

Makrolon pc 6557 achieves UL 94 V-0 at 3.0 mm thickness and a high Oxygen Index (36%), providing critical fire resistance for electrical and electronic components, enhancing end-product safety and meeting stringent regulations.

Enhanced Durability & Clarity

Built-in UV stabilization protects against yellowing and degradation from sunlight exposure, maintaining mechanical integrity and optical clarity (up to 89% transmittance @ 1mm) for demanding indoor and outdoor applications.

Optimized Processing Efficiency

Its medium viscosity and easy-release characteristics reduce mold fouling and sticking, enabling smoother injection molding cycles, faster production, and lower maintenance costs for manufacturers.

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Advanced Manufacturing

Extruder machine
High-speed mixer machine
Water ring pelletizer
Automatic bagging machine
Vibrating screening machine
Plastic rein material warehouse storage capacity
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