Covestro Makrolon® 6455 PC Resin
Makrolon 6455 PC Resin Medium Viscosity Transparent
Covestro Makrolon 6455 is a flame-retardant, medium-viscosity polycarbonate resin ideal for injection molding. With UL 94V-0 certification (3.0 mm), easy release, and MVR 12 cm³/10 min (300°C/1.2 kg), it delivers safety and process efficiency. Available in transparent, translucent, and opaque colors.
Plastic Granules
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (MVR): 12 cm³/10 min (ISO 1133, 300 °C/1.2 kg)
- Melt Mass-Flow Rate (MFR): 12.5 g/10 min (ISO 1133, 300 °C/1.2 kg)
- Molding Shrinkage (Parallel): 0.65% (ISO 294-4, 60x60x2 mm³/500 bar)
- Molding Shrinkage (Normal): 0.7% (ISO 294-4, 60x60x2 mm³/500 bar)
Mechanical Properties (23 °C/50% r.h.)
- Tensile Modulus: 2400 MPa (ISO 527-1, -2; 1 mm/min)
- Yield Stress: 66 MPa (ISO 527-1, -2; 50 mm/min)
- Yield Strain: 6.1% (ISO 527-1, -2; 50 mm/min)
- Flexural Modulus: 2400 MPa (ISO 178; 2 mm/min)
- Flexural Strength: 98 MPa (ISO 178; 2 mm/min)
- Charpy Notched Impact Strength (23 °C): 70 kJ/m² (ISO 21305/ISO 179/1eA, 3 mm)
- Charpy Notched Impact Strength (-30 °C): 14 kJ/m² (ISO 21305/ISO 179/1eA, 3 mm)
- Puncture Energy (23 °C): 60 J (ISO 6603-2)
- Puncture Energy (-30 °C): 65 J (ISO 6603-2)
Thermal Properties
- Glass Transition Temperature: 145 °C (ISO 11357-1, -2)
- Deflection Temperature under Load (1.8 MPa): 124 °C (ISO 75-1, -2)
- Deflection Temperature under Load (0.45 MPa): 136 °C (ISO 75-1, -2)
- Vicat Softening Temperature (50 N, 50 °C/h): 143 °C (ISO 306)
- Burning Behavior: UL 94 V-0 (3.0 mm) / UL 94 V-2 (1.5 mm)
- Oxygen Index: 35% (ISO 4589-2)
Electrical Properties (23 °C/50% r.h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Relative Permittivity (1 MHz): 3.0 (IEC 60250)
- Dissipation Factor (100 Hz): 0.0008 (IEC 60250)
- Dissipation Factor (1 MHz): 0.009 (IEC 60250)
- Electrical Strength: 34 kV/mm (IEC 60243-1)
Other Properties (23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Water Absorption (Saturation Value, 23 °C): 0.30% (ISO 62)
- Water Absorption (Equilibrium Value, 23 °C, 50% r.h.): 0.12% (ISO 62)
- Refractive Index: 1.586 (ISO 489)
Processing and Drying Conditions
- Melt Temperature: 280–320 °C (Recommended), 300 °C (Standard)
- Mold Temperature: 80–120 °C
- Drying Temperature: 120 °C (Dry Air)
- Drying Time: 2–3 hours
- Moisture Content (Max.): ≤ 0.02%
- Injection Velocity: 200 mm/s (ISO 294)
Use & Applications
- Electrical/Electronics: Circuit breakers, fuse boxes, and connectors (UL-certified safety).
- Automotive: Dashboard components, lighting housings (impact/cold resistance).
- Industrial: Safety visors, machine guards (clarity + flame retardancy).
- Consumer Tech: Power tool housings, charging stations (durability + design flexibility).
Features & Benefits
Uncompromised Fire Safety
UL 94V-0 rated at 3.0 mm thickness, Makrolon 6455 meets strict flammability standards. Ideal for electrical enclosures, reducing fire risks in high-heat environments.
Toughness in Extreme Conditions
Charpy notched impact strength of 70 kJ/m² (23°C) and 14 kJ/m² (-30°C) ensures durability. Perfect for automotive or outdoor components exposed to impacts and cold.
Precision Molding, Zero Hassle
Medium flow (MVR 12 cm³/10 min) and low shrinkage (0.6–0.8%) enable complex designs with tight tolerances. Easy release cuts demolding time and rejects.
Makrolon® 6455 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 |
|---|---|---|---|---|---|---|---|
| 6457 | Medium viscosity; UV; transparent | V-2 @1.5mm; V-0 @3.0mm | 12 cm³/10min | 123°C | Charpy 70P(C); Izod 65P | T/O | Yes / N/A |
| 6555 | Medium viscosity; transparent | V-0 @3.0mm; V-2 @1.0mm | 10 cm³/10min | 125°C | Charpy 70P; Izod 65P | T/T/O | No / N/A |
| 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 |
| 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 |
👉 Full Portfolio: Browse all 27+ grades on the Covestro Flame Retardant PC Resin Hub.