Covestro Makrolon® 6555 PC Resin
Makrolon 6555 Medium Viscosity Transparent FR PC
Makrolon® 6555 by Covestro is a flame-retardant, medium-viscosity polycarbonate resin. With UL 94 V-0 certification (3.0 mm), easy mold release, and versatile transparency options, it excels in demanding injection molding applications. Ideal for electrical and industrial components.
Plastic Granules
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ISO TDS
MSDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (300 °C/1.2 kg): 10 cm³/10 min (ISO 1133)
- Melt Mass-Flow Rate (300 °C/1.2 kg): 10 g/10 min (ISO 1133)
- Molding Shrinkage (Parallel, 500 bar): 0.7% (ISO 294-4)
- Molding Shrinkage (Normal, 500 bar): 0.75% (ISO 294-4)
Mechanical Properties (23 °C/50 % r.h.)
- Tensile Modulus (1 mm/min): 2400 MPa (ISO 527-1, -2)
- Yield Stress (50 mm/min): 66 MPa (ISO 527-1, -2)
- Yield Strain (50 mm/min): 6.2% (ISO 527-1, -2)
- Nominal Strain at Break (50 mm/min): > 50% (ISO 527-1, -2)
- Flexural Modulus (2 mm/min): 2400 MPa (ISO 178)
- Flexural Strength (2 mm/min): 98 MPa (ISO 178)
- Charpy Notched Impact Strength (23 °C, 3 mm): 70 kJ/m² (ISO 21305, based on ISO 179/1eA)
- Izod Notched Impact Strength (23 °C, 3 mm): 65 kJ/m² (ISO 21305, based on ISO 180/A)
Thermal Properties
- Glass Transition Temperature: 145 °C (ISO 11357-1,-2)
- Heat Deflection Temperature (1.80 MPa): 125 °C (ISO 75-1,-2)
- Heat Deflection Temperature (0.45 MPa): 137 °C (ISO 75-1,-2)
- Vicat Softening Temperature (50 N, 50 °C/h): 144 °C (ISO 306)
- Burning Behavior (3.0 mm): UL 94 V-0 (UL 94)
Electrical Properties (23 °C/50 % r.h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Dissipation Factor (100 Hz): 8 × 10⁻⁴ (IEC 60250)
- Electrical Strength (1 mm): 34 kV/mm (IEC 60243-1)
Other Properties (23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Water Absorption (Saturation): 0.30% (ISO 62)
- Luminous Transmittance (Clear, 2 mm): 89% (ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature (Injection Molding): 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%
Use & Applications
- Electrical Enclosures: Flame-retardant housings for switches/connectors.
- Transparent Covers: Light diffusers, indicator lenses, or display panels.
- Industrial Components: Machine guards, safety visors, and automotive modules.
- Consumer Tech: Charger casings, power tool housings, and appliance parts.
Features & Benefits
Reliable Flame Retardancy
UL 94 V-0 certified at 3.0 mm thickness, Makrolon PC 6555 ensures critical fire safety in electronics and enclosures—reducing compliance risks and enhancing end-user protection.
Optimized Processing Flow
Medium viscosity (MVR 10 cm³/10 min) enables smooth injection molding of thin-walled parts, minimizing defects while maintaining high tensile strength (66 MPa yield stress).
Clarity & Durability
It achieves 89% luminous transmittance (1 mm) with easy-release properties. Perfect for transparent covers or indicators needing scratch resistance and optical precision.
Makrolon® 6555 Related Flame Retardant Grades
Disclaimer: Grades below are potential alternatives for comparison only. Not direct drop-in replacements. Typical values from Covestro ISO TDS; verify UL94 colors/thickness on current UL Yellow Card. RoHS/REACH/halogen/PFAS status not confirmed unless report provided.
| Grade | Positioning | UL94 (ISO TDS) | MVR | HDT (1.80 MPa) | Notched Impact (23°C/3mm) | Color | UV / UL 746C f1 |
|---|---|---|---|---|---|---|---|
| 6557 | Medium viscosity; UV; transparent | V-2 @1.5mm; V-0 @3.0mm | 10 cm³/10min | 124°C | Charpy 70P(C); Izod 65P | T/T/O | Yes / N/A |
| 6555 RE CQ | RE CQ; medium viscosity | V-0 @3.0mm; V-2 @1.0mm | 10 cm³/10min | 125°C | Charpy 70P; Izod 65P | N/A | N/A / N/A |
| 6455 | Medium viscosity; transparent | V-2 @1.5mm; V-0 @3.0mm | 12 cm³/10min | 124°C | Charpy 70P; Izod 65P | T/T/O | No / N/A |
| 2865 | Medium viscosity; transparent | V-2 @0.75mm; V-0 @6.0mm | 10 cm³/10min | 125°C | Charpy 75P; Izod 65P | T/T/O | No / N/A |